I can't work out how to get to the bulb holder, I know for a headlight bulb you get to it from behind without removing the whole lamp unit but I think you need to get the top cover off to do the sidelight? I undid the 2 hexagonal screws but the unit is still attached and I can't get underneath it to see where else it is attached! The diagram in the car manual is useless and only shows you how to remove the bulb once you have found it but not how to get to it. Anyone done this before and can help?!?