The voltage reading on Q4 base and emitter are the same with reference to chassis gnd, that should mean Q4 is off. Q4 measures ok on the board, maybe replace it and see. Makes no sense to me.
Basically touched up some solder joints on a few of the resistors around Q4 and Q5 and now it works. crazy, crazy.....
Would be interesting to take a look at one of these amps with a FLIR camera.. I've had two on my bench with problems in this area.
I have one at work, we use it all the time for UL temprise testing. I bet the driver card glows!!
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