this was a bigger problem on earlier speedies, I had two replacement wheels under warranty in 14 month.
they have got better because we haven't heard much of this lately!
06 / 6500 and garage kept.... I would take close up quality pics showing corrosion and a write to Warranty dept. with support for its overall condition from your dealer, mention the problems on 03/04's..... you could get lucky.
The best way overall is to strip down and get it powder coated.... front as well to make them look a pair!!
