After some investigation today, I know for sure that one of the ballast units on my xenon headlights has stopped working after some water got in to it. I have tried cleaning and drying the unit without success, so now I'm trying to find a replacement.
The serial number on mine is 1 307 329 091 and I have seen one listed on ebay
from an Audi TT with serial number 1 307 329 066. I can see from some previous posts that others have used different ballast units (e.g. from a mondeo) but I would like to know if the self-levelling still works with a different unit? Has anyone used one with this serial number before or does anyone have any they would be willing to sell?