Work with no load until the amp is stable and not making DC.
Don't even think about signal while there is 34vDC on the output. D8,9 shouldn't affect the power light, but do you have good power rails? No system works if the power supply isn't right. You have +40 and -40, more or less? I don't care if they are 42v or 37v, as long as both are about the same. And do you have both +16 and -16? Easiest way is to find the two large resistors, R66,68, 270 ohm 5 watt. on each, 40v at one end and 16v on the other.
If a 16v is missing, that will shove U3 in the power amp over to one side. So what is on pins 1 and 7 of that IC? Whatever is on pin 7 is likely to be what is on the speaker too.
You had to replace the outputs? OK< any time you do that in any amp, the drivers are instantly suspect, as they likely were stressed by the bad power transistors. Also always check the associated resistors, in this case: 47 ohm and 220 ohm. I usually replace the drivers even if they SEEM to be OK.
Once the amp settles down to zero volts DC on the output, THEN worry about signal.