the mom screen went out. which short out the amp and drains the battery.the mms system control the heat air . radio, nav. car setup. telephone . and information center. . it will cost 2200.00 to replace a amp and not fix the problem. the water will back up and drain out onto the floor, which may cause electrical problems, audi should replace this or fix this problem due to its seem its happening to all their cars with sunroofs. *tr