Polytone 100 - power amp issue

[g1]

These are new output transistors (Q6 & Q7)? The original ones measured bad (post #1).
If Q3 does not measure bad I would not replace it.
For Q4,Q5, I would use something like TIP41 and TIP42, but you will have to adjust the placement if different pin-out.

[reverbus]

These are new output transistors (Q6 & Q7)? The original ones measured bad (post #1).
If Q3 does not measure bad I would not replace it.
For Q4,Q5, I would use something like TIP41 and TIP42, but you will have to adjust the placement if different pin-out.

No, all transistors were tested outside PCB, and tested good.
I used DCA55 Atlas tester and diode tester additionally, just to confirm results.

I have no idea what is causing Q5/Q7 to open.
Voltages at bases (bias) of both drivers are different, clearly at Q5 is higher…