So I started having this issue around 55k as well but I’m not a car guy. However My guess is the Mercedes battery. Issue started right after I had to go to the dealership to get the new battery. (Again,not a car guy. I could not find the battery in any major/mid brand store.) My left Led went out shortly after. My aux battery would then go bad a few months later and after getting THAT replaced my right side Led went orange… I recently heard a rumor that the newer Mercedes battery doesn’t fit well with the old electronics. And I can’t recall for certain but I would say it was resistance related. ANY and all feedback would be great. I’m in SC