I have never done one on a TT however maybe the below will help if you cant get into the back of the headlight unit.. - its worth a go....
below is the post i updated a while back regarding the replacment of headlight bulbs for a A4- B6
You need to take the headlight unit out if its on the left hand side (due to power steering reservoir, if on the right hand side you can just about get to the cover to remove it...
If you need to remove the head lights .. it simple... 4 torque screws on the top.. undo and slide towards youself.... (place on something soft and remove the plastic cover and change bulb.. reinstall and tighten )
Thats all thats to it..
( Also.... please use the search function on the top of the forum as i lot of common issues have already been posted and resolved... it could save you time!! )
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