PACE PRC2000 / TIP107 failures

[skimask]

I think I found the ROOT cause of the problem.
LM324, U1, pin 7 seems to be stuck high. Can't get it to go low no matter what I do to the + and - inputs, pull to ground, pull to V+, whatever. I can get the other 'sections' of U1 to do what I want using the same methods.
Swapped it out with a new one. The output at pin 7 acts like I want it to, as do the rest of them. Can't check it out completely yet, still don't have a high-gain replacement for Q22 on hand.

[skimask]

I think I found the ROOT cause of the problem.....
Can't check it out completely yet, still don't have a high-gain replacement for Q22 on hand.

Update to the update...
Finally got my hands on actual TIP107's.
Swapped 'em out, ran the microchine for about 15 minutes, works like a champ...
The original problem (besides the bad LM324) might have also had a little something to do with the fact that Q22 originally didn't have any heatsink compound under the TO-220 case at all...don't know...don't care...it's all working...