Brake Light problems of the 2007 Mercedes Benz E350

Suddently the vehicle trunk does not open, tried both remote key & door trunk latch. Got a message on panel regarding 3rd brake light. . Unable to get the wheelchair from trunk but drove car around the block and was then able to open it using my key remote. Then a few minutes later again was not able to open the trunk, but now the panel read licence plate right and left light lamps not working. . . Night driving is an issue now. . . Ca laws require lic plate be lit and visible at all times. I went online and noticed all the buzz and complaints reporting this same issue regarding brown wire being severed on many makes, models and years on mer benz vehicles. I e-mailed mb customer service to ask about a recall and they do not have one to my surprise. Got a call today from arash @ (201) 476-6200 stating there is nothing mb can do since my warranty has expired. . . I advised him I have under 50k miles on this car, he said that I would need to get a dioganistic test costing me over $100 in order to find out what the problem is plus according to internet comments this is a $250 or more repair cost. I explained my internet findings and he again apologized, said there is nothing he can do for me. I explained my concerns and feel that mb should step up and take responsibility in good faith and good customer service and fix this issue at their expense, obviously it is an electrical issue mal-function and they are responsible for fixing the problem and should not put this burden and expense on their customer's. Frustrated mb customer.