My 2002 A6 Quattro sat outside the other night in the rain with the trunk higher than the front of the car as I always back my car into driveway. Anyway since the rain now my stereo has problems that it did not have before. When I first got in it after the rain all you could hear was crackling sound from radio...eventually the sound came back on the right hand side of car bot nothing on drivers side yet and it seems my rear speakers are not working correctly either. Am wondering how to check to see if its the radio itself or if there might still be moisture in the system somehow..Any body have any ideas? Love my Audi but a pain to work on.