An odd fault, no audio out as though in mute mode. The user manual says
if in mute the volume knob LED flashes. What LED, nothing lit, just the
power LED and function LEDs.
The 2 thin wires that loop around the rotating pot motor shaft must have
snagged somewhere and tugged enough to bend up the pcb connector socket
and break a wire somewhere. If no LED load , the amp goes into
protect/mute? the next time the amp is powered up, but caries on as
normal until put in standby.