Greetings... great thread!
Recently noticed my T775 FR channel is dead. Others fine, including right surround. Tried analog by-pass but FR still dead.
Took it to a local service gent that usually works on 2-channel and he confirmed that the power module seems fine. FR channel isn't emitting anything from the driver stage. I likely have the wrong terminology but he could only really check whether the power module was OK.
I don't recall any module upgrades... firmware:
Generally I don't like to mess with stuff if I risk making it worse, but any thoughts on simply reseating the boards or doing a factory reset? I should have the right serial cable somewhere but haven't tried connecting to my PC to poke around, backup or upgrade.
I'll drop a note to NAD as well... just avoiding the formal local service shop until I've looked into the DIY options.