I did further investigations and it seem that the error amplifiers (U105) sometimes is feeded with -120mV from somewhere. When this fault voltage is "resat" the K2 has zero on output. The difficulties with the below 1V on speaker terminals (now in both channels) is mainly when very low music is applied to the amp. Both U105 "flicker" and then when more level is added to the music, the dc error is adjusted!!!
My amp. is using 160W from mains and generate a lot of heat. This gives an chassis temperature of 48 degrees Celcius (long term). Can the U105 due to heat, have reduced openloop amplification at that point and should I try to reduce the very high valued resistors feeding the pin8.
Can someone at Crown maybe comment on that?