I don't have any data on that machine but have done many repairs made to a variety of machines without schematics. Two things go wrong with machines that sit a long time. Mostly mechanical for adjustments and knobs, and wires getting brittle. Then there are the capacitors. They often go bad just sitting there. Look for swelling on the electrolytic caps and look for any skewing away from the PC board. I always have a few hundred of them laying around in many values so if I have a particularly puzzling problem, I just replace all of the electrolytic capacitor.
Look closely at your potentiometers to see of they are corroded and if there is any graphite powder coming out of them. Where the wires meet the board, look for gray looking corrosion.
One tip for you is something I always do. Take a few pictures so you know where all the wires go if one happens to break.
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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
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