Realistic STA-2080 Assistance Needed

Touched up solder joints, pulled the trimmer and it tested fine again, so I'm going to keep digging I guess.
 
trimmer might be breaking down under load . or something else is .
Dumb question, but it could be the output transistors doing that correct? I would only have to worry about silicon breaking down I think and that's the only thing I haven't replaced.
 
Replaced the outputs, now the bias can go down to 20ish. When I leave it there eventually it cuts down to zero. What am I missing?
 
And that wasn't it. Not that I'm surprised. Next order I might just order all new transistors again, and clean the board with rubbing alcohol once more.
 
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