Most problems with bias current adjustment are caused by the potentiometer........ Carefully try to meassure the output of the potentiometer and check that it actually variates the voltage to the base of the Bias transistor
Thanks Jan for the reply.I changed the pot and checked on the board for change of resistance. Everything checked good.
I put a squarewave on the input and got a amplified output but it was not clean.
The good channel is biased to 115 ma and works but its response is notably different than my Sumo. Less bass.