I lost the 2nd and 4th quads. Took it to the dealership and it started working. Monitored it for 6 months, until they stayed off consistently. The ring is either made up of incandescent light filaments or, poorly manufactured, based on all the feedback I've read here. The dealership did, after the second trip, order the part and replace free of charge. Unfortunately, I didn't notice for a couple of weeks, but there is a very slight ding next to the light ring. I suspect the technician did this while replacing the light ring. As I said, it is very minor.