
592 N.W.2d 786 (1999)
233 Mich. App. 514
Arthur LAGALO, Plaintiff-Appellee/Cross-Appellant,
v.
ALLIED CORPORATION, Defendant-Appellant/Cross-Appellee.
Docket No. 172606.
Court of Appeals of Michigan.
Submitted June 24, 1998, at Lansing.
Decided January 22, 1999, at 9:10 a.m.
Released for Publication March 23, 1999.
*787 Mark Granzotto, Detroit, and John Walt, Southfield, for the plaintiff.
Kell & Lynch, P.C. (by M.V. Kell, Margaret A. Lynch, and Jose L. Patino), Birmingham, for the defendant.
Before: SAAD, P.J., and McDONALD and HOOD, JJ.

ON REMAND
SAAD, P.J.
Previously, defendant appealed and plaintiff cross appealed from an order of judgment entered on a jury verdict in this *788 products liability case. We reversed and remanded for a new trial on the ground that the jury's verdict was irreconcilable. 218 Mich.App. 490, 554 N.W.2d 352 (1996). Our decision rendered the remaining issues moot, and we did not address them. Our Supreme Court, 457 Mich. 278, 577 N.W.2d 462 (1998), has reversed our decision and remanded for consideration of the remaining issues. We affirm.

I. FACTS
The facts of this case are reported in full at 218 Mich.App. 490, 554 N.W.2d 352. Briefly stated, a Muffler Man repair shop replaced the master brake cylinder in plaintiff's 1982 Chevette, installing a new master cylinder manufactured by defendant's predecessor. Ten days later, plaintiff's brakes failed, causing an accident in which plaintiff suffered injuries. Plaintiff sued defendant on theories of negligence and breach of implied warranty. The jury found negligence, but no breach of implied warranty. The trial court entered a judgment. On appeal, defendant challenges the verdict on grounds of evidentiary error, instructional error, and improper reduction of future damages to present value. Plaintiff cross appeals, also claiming error in the reduction of future damages and the court's application of the collateral source rule.

II
Defendant claims that the trial court erroneously precluded it from introducing into evidence as part of its case in chief a copy of a certificate issued by the state stating that Richard Schlink, a Muffler Man mechanic, was certified as a brakes and braking systems mechanic. We review a trial court's decision to admit or exclude evidence for abuse of discretion. Davidson v. Bugbee, 227 Mich.App. 264, 266, 575 N.W.2d 574 (1997).
Richard Schlink testified that he examined the brake system in plaintiff's car and concluded that the master cylinder had been properly installed, but that the cylinder was defective. During cross-examination of Schlink, defendant asked whether Schlink had been certified in the area of brakes at the time of the inspection. Schlink replied that he was. Defendant waited until the presentation of its case in chief to attempt to introduce the certificate, which indicated that Schlink did not receive this certification until three months after the inspection. The trial court ruled that this was impeachment evidence and would not permit defendant to introduce it because Schlink had not been given an opportunity to explain the discrepancy.
We find no abuse of discretion in this ruling. The only apparent purpose of the certification evidence was to cast doubt on Schlink's credibility and credentials. It was not related to any material trial issue. Thus, it was not substantive evidence, but impeachment evidence. McMiddleton v. Otis Elevator Co., 139 Mich.App. 418, 425-426, 362 N.W.2d 812 (1984). It is a "well-settled rule that a witness may not be impeached by contradiction on matters which are purely collateral." Cook v. Rontal, 109 Mich.App. 220, 229, 311 N.W.2d 333 (1981). Whether a matter is collateral "depends upon the issue in the case." Id. Schlink's certification for brake work was a collateral matter, because it was not related to any issue in the case. The trial court must weigh the benefit of extrinsic impeachment evidence "against countervailing factors such as whether admission will result in or cause undue prejudice, confusion, surprise and the like...." Id. In this case, the trial court decided that the witness would be unfairly prejudiced if not given the opportunity to respond or explain the discrepancy. Additionally, evidence rules do not allow extrinsic evidence to be used to prove specific instances of a witness' conduct for the purpose of attacking the witness' credibility. MRE 608(b). Under these circumstances, we cannot say that this ruling was an abuse of discretion. Furthermore, even if there had been error, the error would be harmless, because another witness, Thomas Christianson, gave identical testimony regarding the cause of the brake failure.

III
During the trial, defendant did not produce the brake cylinder as evidence. The trial *789 court gave jury instruction SJI2d 6.01(d), which reads in relevant part:
You may infer that this evidence would have been adverse to the [plaintiff/defendant] if you believe that the evidence was under the control of the [plaintiff/defendant ] and could have been produced by [him/her,] and no reasonable excuse for [plaintiff's/defendant's] failure to produce the evidence has been shown.
Defendant argues that giving this instruction was error because the evidence did not support findings that the evidence was under its control or that defendant intentionally withheld or destroyed the cylinder.
We review jury instructions for abuse of discretion. Colbert v. Primary Care Medical, P.C., 226 Mich.App. 99, 103, 574 N.W.2d 36 (1997). Jury instructions must accurately state the law and must be warranted by the evidence presented. Klinke v. Mitsubishi Motors Corp., 219 Mich.App. 500, 515, 556 N.W.2d 528 (1996), aff'd. 458 Mich. 582, 581 N.W.2d 272 (1998).
Contrary to defendant's assertion, the evidence supported a finding that defendant had control of the master cylinder. Testimony established that the Muffler Man shop returned the cylinder to the H & H Wheel Service Bay City, Inc., where Muffler Man bought it, and that H & H's standard practice was to return the defective part to the Bendix facility in Tennessee. This testimony supported a finding that the cylinder was under the control of Bendix (later defendant).
Defendant also argues that giving SJI2d 6.01(d) was inappropriate because there was no evidence to establish that it had wilfully destroyed or withheld the evidence. Defendant's argument is premised on Trupiano v. Cully, 349 Mich. 568, 570, 84 N.W.2d 747 (1957), wherein our Supreme Court stated:
"It is a general rule that the intentional spoliation or destruction of evidence raises the presumption against the spoliator where the evidence was relevant to the case or where it was his duty to preserve it, since his conduct may properly be attributed to his supposed knowledge that the truth would operate against him." 20 Am.Jur., Evidence, § 185, p. 191.
The full section continues, however:
"Such a presumption can be applied only where there was intentional conduct indicating fraud and a desire to destroy and thereby suppress the truth."
Trupiano thus stands for the proposition that the presumption that nonproduced evidence would have been adverse applies only where there is evidence of intentional fraudulent conduct and intentional destruction of evidence. In contrast, SJI2d 6.01(d) allows only for a permissible inference that the evidence would have been adverse. The Supreme Court explained the difference in Widmayer v. Leonard, 422 Mich. 280, 289, 373 N.W.2d 538 (1985):
[T]he function of a presumption is solely to place the burden of producing evidence on the opposing party. It is a procedural device which allows a person relying on the presumption to avoid a directed verdict, and it permits that person a directed verdict if the opposing party fails to introduce evidence rebutting the presumption.
Almost all presumptions are made up of permissible inferences. Thus, while the presumption may be overcome by evidence introduced, the inference itself remains and may provide evidence sufficient to persuade the trier of fact even though the rebutting evidence is introduced.
In other words, an unrebutted presumption would require the finder of fact to conclude that the unproduced evidence would have been adverse. SJI2d 6.01 merely permits an inference that it would have been adverse; the jury is free to decide for itself. As this Court stated in Brenner v. Kolk, 226 Mich.App. 149, 155-156, 573 N.W.2d 65 (1997), "SJI2d 6.01 states that a jury `may infer that the evidence would have been adverse to' plaintiff. Because `may' is a permissive term, the jury would not have been required to make such an adverse inference." We therefore hold that SJI2d 6.01 properly allows an inference that the evidence would have been adverse where the party controlling the evidence has failed to produce it, whereas Trupiano allows a presumption only where there is evidence of wilful fraud or *790 destruction. Defendant's claim of instructional error therefore fails.

IV
Defendant claims that the trial court erroneously reduced future damages to present value using a simple rate of interest. Defendant argues that M.C.L. § 600.6306(1)(c) and (d); MSA 27A.6306(1)(c) and (d), which require reduction of future damages to "gross present cash value," require use of a compound rate of interest. Our Supreme Court held in Nation v. W. D. E. Electric Co., 454 Mich. 489, 498-499, 563 N.W.2d 233 (1997), that the reduction should be computed using the simple interest rate. The trial court correctly used simple interest.
We now turn to plaintiff's cross appeal issues.

V
Plaintiff introduced evidence that he had sustained $78,021.98 in past medical expenses. Plaintiff and defendant stipulated a verdict form that required the jury to calculate past and future damages separately, but did not require them to separate economic damages from noneconomic damages. The jury awarded plaintiff $78,021.98 in past damages and $2,476,786 in future damages. Because the figures for past damages and plaintiff's medical bills were identical, the trial court determined that the award for past damages could only be interpreted as an award for medical bills. Because plaintiff's automobile insurer had already paid the medical bills, the court applied the collateral source rule and reduced the past damages award to zero.
Plaintiff argues that the trial court abused its discretion in "speculating" that the past damages award was entirely based on economic damages. Plaintiff inaccurately characterizes the trial court's action as "speculation." The trial court's decision was not arbitrary; there was no other logical explanation why the past damages figure precisely equaled the past medical expenses. Similarly, in Weller v. Mancha, 353 Mich. 189, 91 N.W.2d 352 (1958), the Michigan Supreme Court concluded that a jury's damages award must have been based entirely on the stipulated special damages because the two figures were identical. Id. at 195-196, 91 N.W.2d 352. We therefore find nothing improper in the trial court's determination that the collateral source rule should be applied to the entire past damages award.
Alternatively, plaintiff argues that if the entire past damages award can be attributable entirely to his past medical bills, then the jury ignored uncontroverted evidence of pain and suffering and rendered an inadequate verdict. Plaintiff requests a new trial with regard to the issue of damages.
Michigan law recognizes that a damages award that ignores uncontroverted evidence that a plaintiff had pain and suffering as a result of the defendant's conduct is inadequate. Weller, supra; Fordon v. Bender, 363 Mich. 124, 125-126, 108 N.W.2d 896 (1961); Cooper v. Christensen, 29 Mich.App. 181, 184, 185 N.W.2d 97 (1970). However, the remedy plaintiff seeks is a new trial with regard to the issue of damages only. This is permissible only where a defendant's liability is clear. Garrigan v. LaSalle Coca-Cola Bottling Co., 373 Mich. 485, 489, 129 N.W.2d 897 (1964); Brewster v. Martin Marietta Aluminum Sales, Inc., 145 Mich.App. 641, 669, 378 N.W.2d 558 (1985); Trapp v. King, 374 Mich. 608, 611, 132 N.W.2d 640 (1965); Bias v. Ausbury, 369 Mich. 378, 383, 120 N.W.2d 233 (1963). Here, defendant's liability was not clear. There was evidence from which another jury might have concluded that the brake cylinder was in acceptable condition, but the Muffler Man shop improperly installed it. Under these circumstances, we cannot order a new trial with regard to the issue of damages alone.

VI
In his final issue, plaintiff claims that the trial court should not have reduced the future damages award to present value because the parties had stipulated that such a reduction would not be made. Plaintiff alleges that this stipulation was made off the record, during a conference in the trial court's chambers. Because there is no record, this Court is unable to review this issue. Admiral Ins. Co. v. Columbia Casualty Ins. *791 Co., 194 Mich.App. 300, 305, 486 N.W.2d 351 (1992).
We also decline to remand for an evidentiary hearing regarding this issue. Plaintiff and defendant have already presented to the trial court their interpretations of the in-chambers conference. The trial court concluded that it could not "say with certainty that defendant did waive its right to have future damages reduced to present cash value...." Under these circumstances, we cannot see how an evidentiary hearing would serve any purpose.
Affirmed.
