You will need a complete unit not repairable and probably as mine was completely corroded.
Also a rare eventAlways good to read that VW picked up the tab!
what clause in the warranty did you quote? Mines in to be replaced now. 2016 R-lineMy rear fog light recently failed. It did not report a fault. Dealer replaced it under warranty. Prior to them reading their own warranty, they wanted £360 to supply (and fit I think it was).