hifi engine

Need a schematic for a Audiotraks at500 amp

I have two Audiotraks AT500 amplifiers that I loaned to a friend. He somehow managed to blow both of them up! There are a number of resistors that have been damaged to the point where their values can't be read or measured and as luck would have it, the same resistors are gone on both.

Before I can repairs these amps, I need the schematic and can't seem to fine one anywhere. If you have a schematic or service manual, I would love to get a capy.