Having the same problem. what is frustrating, I have been in automotive for years, owned 3 tt convertibles and this is the only one with water damage. the drain hole needs to be kept clear. it's location is a stupid idea. I used a tyre inflation kit. plug in and shove between the qtr and the plastic side trim. the best way to locate is when the roof is down. there is a rubber sits between roof and qtr panel. if you run some hot water into this rubber, you will see exactly where the water goes. hot water shoyld clear the blockage. as for the Amp. audi will charge as much as they can. I think Audi should have informed customers to maintain this area
