My alpha 10+DAVE started humming on CD and AV inputs, sound is warbled on TUNER. This intially occurred a few minutes after switch on, now it's permanent. I took it to my dealer to test and found the same problem. Back at home, I disconnected the DAVE module, the amp works perfectly well in 2 channel mode. Another thing which I had not noticed before is that if I plug something into the CD input for example, then switch to TUNER (with nothing plugged into this input), the sound from the CD input can be heard if the volume is turned up. Is this sufficient for diagnosis ? If the DAVE board itself is broken, is it repairable ? If not, what are the replacement costs ? Thanks for your help.