I have been told that to change one of these bulbs ,its the back door panel off , there are 2 screws in the covers which are heavily rusted ,is it just a case of taking these out .
ETR
According to Haynes all you do is loosen the two screws,lift out the light unit, then remove bulb and replace with new.Give the screws a good dose of wd40first. Replace with new or even self tappers.
cheers
jim Anderson
1996 300Tdi auto(Jap reimport)