Hey, a free amp is always a welcome item in my book.
A bad input could be as simple as resoldering. I think that will have closed jacks pcb mounted jacks, but I'm not an expert when it comes to amp repair. However there are a few members here that really know their stuff with these things!
Hopefully they'll come to the rescue...
One thing I can can tell you for certain, is that will have deadly electrolytic capacitors in it. Be sure to discharge them properly before you go poking around in there!
BTW, if you haven't got it already, I found this:
https://www.audioservicemanuals.com/...2-89-schematic
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