Anyone know how to change the taill light bulb on the new (>2004) model A6. My helpful dash tells me that both stop and tail on passenger side have failed (I know it's one bulb) and the manual says I need a dealer to do such a complex task. I've searched the forum and found the refernces to the A4 but cannot for the life of me find a screw holing in the lamp unit. Anyone know where Ican find this illusive object?

TIA