Peavey SC400 PA brain (No Output question)

[g1]

OK, I was thinking only 2 pnp output devices. You say there are 4. The schematic shows 2 amps, each with 2 pnp and 2 npn output devices.
Are you saying the pnp outputs in both amps are showing short when hot? I can't think of a fault that would cause the problem in both amps. Even if it is a bad driver, the other amp shouldn't be affected.
You mentioned main and monitor, this schematic shows left and right, bridgeable.
Not quite sure what you meant by main and monitor outs.

[freeformfx]

ok yes, as you see in the layout schem all 4 pnp outputs are situated together in a row on the neg rail under one heatsink, they get BLAZING hot in seconds when powered up and will all read the same shorted condition for a bit until cooled.
far as the main/monitor thing I'm not sure about why it's different on the schematic(everything seems to match in the circuitry) but I can say on the back panel there are two jacks labeled power amp 1 MAIN and two jacks for power amp 2 labeled MAIN/MONITOR
no bridge output I can see , but a front panel switch to select main/mon
hope this helps.

[Jazz P Bass]

I wouldn't go as far as calling it a stereo amp but there are two separate power amps.
When the front panel switch is set to "Main", both amps are driven by the "Main" preamp signal.
The monitor preamp signal only goes to "Monitor Out".
When the front panel "Main/ Monitor" is selected the Monitor preamp signal is also sent to the one power amp (marked Main/ Monitor) & the "Main" signal will only drive the one power amp (marked "Main")

[g1]

Just to be clear, the short in the pnp outputs is C-B and not C-E? And it is in both amps?