I am getting an error for my right rear back up light and also now my right turn signal after my 2003 A-4 Cabriolet 3.0 came back from repair shop. The repair shop said they replaced the rear back up bulb, but still failing. They say it's something more, but won't tell me what or how much without further digging. I decided to do my own research and replace the bulbs as well. The next logically thinking failure is the wiring harness in the tail light. I don't see any internet videos replacing these. Does anyone have any experience with them? It appears that they have a plug and seems pretty simple to replace.? The part isn't too expensive. Any help would be greatly appreciated.