I just got the same experience from the dealership here. I have a brake light out, in my other car, and this is the first time they have seen it. The first time they replaced fuses and charged me about $300. They actually let me leave with the brake light not working!! When I found out two days later, I took it back. They said they would need to replace the circuit board. Another $120 plus labor. I said hell no and got an original Mercedes part for $44. After over an hour in my garage I changed it out. Still not working! Did hours of research and found that the SAM unit is either bad or simply needed reset. I took it in this morning and told them to reset my SAM and if it didn't work, I would find a new unit somewhere. After 5 hours! They finally said, the SAM unit is fried (no shi#) I just said that. $125 bill and still not working brake light. Should I ask for my money back?