Hi, I'm new here, so sorry if I've posted in the wrong place. My A6 2010 Avant (satnav, cdchanger in glove box, mmi in left boot) has lost all the sound for the radio and media. Just happened one day. The MMI still works, but all the audio options are greyed out. I've reset the MMI a couple of times using the three button press, but nothing changed. I googled a bit and it seems like a cracked rear wash hose is a common cause of damage to the MMI in the boot, however I opened up the boot space and it appears completely dry. I haven't tried operating the rear washer while I have it open though. Also I don't have a VCDS to do a loop test. Can suggest any ideas or help me out (I'm in South Croydon)? I half wonder if one of the kids has pressed something they shouldn't.