PSE amp repair

I have a pair of Professional Systems Engineering (PSE) Studio 5 dual monos paired with a Studio SL pre amp that I have enjoyed for many years. One of the amps now has a failure where in acts like it is overloading and the protection circuitry shuts the amp down even with no input. I have a very good technician here in Boise ID who has tried to fix it but he says without schematics he now can't figure it out. Both he and I have tried to find schematics on these using various sources to no avail. There is now no contact with Dean Klienfelter, the companies founder, and I can't find anyone else to help. Audiogon is my last hope so if anyone out there can help I would certainly appreciate it before totally giving up. Let me know.