I wonder how many opensky sunroofs have been scrapped when an easy fix was possible. Trouble is that up till now, there has been a cheap(?) option from one dealer in the UK and one in Germany. Maybe no-one has really analysed the root problem and found a solution.
(Oh please don't reply and tell us all for the umpteenth time how you got yours fixed by Audi Worthing because you had a FASH - It doesn't help.)
Cheers, Geoff