I recently moved my av32R from one location to another. Now when I go to select 'tuner' I get the above error. Even when no inputs are connected. To be fair, I did try hooking up my tuner with the av32r powered on and i may have momentarily shorted one of the inputs. Now I am getting this error message on the tuner input, even when nothing is attached. All other analog inputs as well as digital inputs are ok. I am attaching a sonos and i do not know what the dc output is of their line outs. However, I have attached the sonos to another pair of analog inputs , aux, and it works fine. Although I can detect a little hum when the av32R is on and the sonos is off. Must be the output stage of the sonos is not particularly clean. But how I can I troubleshoot this error?