Corrosion on a four-year-old VW Phaeton

I have experienced my second bout of corrosion on my four-year-old old VW Phaeton, this time on the wing mirror housing. VW have refused my claim on the grounds that the wing mirror is not part of the vehilce. Is this reasonable?

Asked on 23 February 2011 by David Welch

Answered by Honest John
No, completely ridiculous. Of course it is part of the vehicle. If it is not part of the vehicle what is it doing there?
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