I had a water leak in mine causing all sorts of eletrical problems. I took it in and they had to replace the wiring harness that runs through the entire vehicle. My invoice reads that there was a water leak passengers side rear tailgate area. I also remember them saying something about the right rear quater panel. I'm not a car buff, so I'm not sure if this is the same problem you are having. I also do not know much about the repair kit, but I do remember my service advisor saying he had to order the harness from MB. The entire process for them to replace the harness took over a month. I hope this is not your problem but if it is you may be experiencing erratic behaviour with your fog lights, windows, and lock/unlock switches.