Mine are bubbled and rusting too but the car is lowered on eibach springs, would that void my warranty?
This shouldn't void your warranty, when I took my one in they did say anything and I had it sitting low.
Not in all cases they will change the wing, if it's not too bad the will strip the paint treat the metal then paint the wing.
....That's right
My car is lowered and I had the wings repaired without any question.
It's entirely up to VW whether they repair or replace. I think it's reasonable to assume that their decision will be based on which is cheaper for them.