You could buy the new motherboard for your Arcam and have it installed for less than $800, and that's even if the DSP board is also bad. $500 if just the main board.
Chances are that's all that is wrong with it, plus the new motherboards are heavily updated to fix the overhearing issues that took out your AVR in the first place.
Chances are that's all that is wrong with it, plus the new motherboards are heavily updated to fix the overhearing issues that took out your AVR in the first place.