Nad M10 V2 no Sound

Hi folks wondering if you can help.

I’ve the bad M10 V2 plugged into a pair of sonus Faber sonetto 5. Been working fine for 2 years but all of a sudden today, no sound.

I’ve tried rebooting, reconnecting cables but no luck. Blue os app also does not kick the speakers into life.

The Audio zones are ok. I see the VU meter bouncing along with the quiet audio.

The amp is not muted.

Any tips?