hi there i had a slight bit of corrosion on my rear wheel arch,took it to silvelink wallsend ,i knew they would come up with some excuse ,they said that the panel had been painted due to a difference in the paint thickness,i knew the back door had been painted because newcastle audi done it ,,,vw benfield sh!te never go back ,take my car to vw indy dealer in blyth fab service everything.VW customer care terrrible icould tell you more but what the heck