Amp question re sound fault (feedback?)

I have an old PCB with an audio fault, the amp is a C1182H.

The sound works BUT I can barely adjust the volume - it's very loud to
put it mildly. Volume pot is fine.

Also, if I turn the volume down very low (or at least try to turn it
down by turning the pot in the right direction) then I get an awful
screech/wail from the speaker. Sounds to me just like the feedback
you'd get from a microphone and amp under certain circumstances.

What would cause such a problem? A fault with the amp? A short
somewhere?



Thanks for any advice anyone can offer