I have the same issue with my A4 rust appearing on the front wings. It must be comman as its the same year. I didn't realise about the paint corrosion warranty before this forum. I haven't owned the car long just like you, had it 8 months, has had full Audi dealer history. Wings were professionally sorted from a private body work specialist, didn't have the wing changed as I was advised to, hense no warranty as I was told it may re appear unless I got it changed and it has. So annoyed so I know the feeling Kev6699, let me know if you do manage to get it sorted?