Hi folks, I acquired two broken Beolab 1. one was easy to fix (tweeter). the other one is more complicated. speakers are (now) ok. The ptb ntc also. I cross installed components between the two and now I know, the faulty component is on the (bigger) amplifier board. Nothing visually defective. a lot of parts on this board, so could anyone please give me a hint, what to measure and exchange? behavior: goes on red, then for a second on green, then stays red. No sound. When changing this board it works, so the malfunction needs to be here. thanx in advance 69er