Hi guys, as a sunroof installer of 40 years almost I've had to repair many problem sunroofs. However the A6 sunroofs have same problems as all VW group vehicles as they are made by the same company .I started repairing them about 9 yrs back and eventually found 8 leaks on each side of the sunroof but not every vehicle leaks through the same point(s)...however to avoid customer come backs I now do all known leaks on every panoramic sunroof I repair so that I can guarantee its waterproof when done .my workshop is in East Kilbride and I have had customers from all over UK including independent Audi dealers .contact details are on the FB page (E.K.Sunroof Centre) hope this helps.