It would not turn on. There was a break in the AC cord so that was solved but the output still looked nasty.
If you want to trace the circuit and find where things go wrong it’s kind of hard because the solder traces are on one side of the PCB and the components are on the other. Very hard to see both at once and you can’t flip the board over and over with the amp on while probing the circuit!!!
You can prop up the PCB and shine a light behind it to make both visible, then it gets easier. Make sure your prop is good and sturdy so nothing shorts to the chassis! I was led to various cracked solder connections and a nicer sine was obtained. Also, in typical Acoustic 370 fashion one of the inductors in the preamp had rattled loose and was rolling around in the amp.