My friend has a 54 tt 3.2 roadster. Her driver's side headlight keeps going off. The side light doesnt come on at all. Is the side light connected to the headlight when it's xenon? Audi have quoted her over the phone about £1000!! I don't know anything about xenon's so any help is much appreciated. Can the bulb be replaced or does she need a full headlamp unit? Thanks for any response.