¶1Frank A. Krieger and John Brown were convicted by a jury of unsworn falsifications to authorities, making false reports to law enforcement authorities and conspiracy. Post-trial motions were filed and argued and the lower court granted a new trial in the interest of justice. This appeal by the Commonwealth followed.
¶2*431The charges arose out of the following fact situation. In January of 1976, Wayne C. May purchased and financed a used diesel truck tractor from Kenworth Trucks Philadelphia, Inc. At the time of the sale, May anticipated that he would obtain a permanent Interstate Commerce Commission lease from Mid-West Emery Freight Lines. When May was subsequently unable to obtain this lease, he asked Ken-worth’s assistance in reselling the truck. A Kenworth salesman referred Ronald Fogel to May. Fogel and May met in March and attempted to negotiate a sale. To that end, May agreed to let Fogel test-drive the truck with the understanding that they would meet the following day at Ken-worth to negotiate the sale. Fogel did not return the truck, and May turned again to Kenworth for assistance. Krieger and Brown, both Kenworth employees, tried to contact Fo-gel or locate the truck. Finally, in September of 1976, more than six months after the truck was taken (during which time no payments were made by anyone on the truck), Krieger and Brown caused criminal charges to be filed against Fogel. The charges against Fogel were ultimately dismissed. The charges against Krieger and Brown alleged that they had made false statements to the police and the district justice in connection with the criminal charges filed against Fogel.
¶3After post-trial motions were argued, but prior to any disposition thereon, Appellees’ counsel discovered that Ronald Fogel, the Commonwealth’s main witness, had a prior criminal record including convictions of crimes concerning fraudulent testimony and fraudulent transactions. Appel-lees petitioned for reargument on their post-trial motions on the basis that the Commonwealth failed to produce this record when requested to do so prior to trial.
¶4*432For reasons not clear from the record, two other issues raised by Appellees were not considered in the lower court’s opinion. Consequently, it was stipulated by counsel (and approved by the Court) that Judge DeFuria’s order be considered as having been based on all three grounds.
¶5The first stipulated issue is whether the Commonwealth’s Petition for an Extension of Time under Pa.R. Crim.P. 1100 was properly granted as to Appellee Krieger.
¶6Since the record in the instant case is so inadequate as to preclude our deciding the merits of the Rule 1100 issue, we remand for completion of the record. We retain jurisdiction over the remaining issues in Commonwealth v. Krieger and over the appeal in Commonwealth v. Brown until the Rule 1100 issue is resolved by the Court below.
¶7. At the time of the trial in this case, there was no other way Appellants could have obtained Fogel’s criminal record.
¶8. Because Appellee Brown did not raise this issue in post-trial motions, it is not properly preserved for our review. Commonwealth v. Milburn, 488 Pa. 601, 413 A.2d 388 (1980).