my ’16 prime is having a tail ligh issue. Both are out. Brake lights work. Turn sig and reverse lights work and are regular bulb. Taillights and brake lights are LEDs. Smart calls it partial LEDs. It’s not a fuse. I was thinking relay but not sure which one? Anybody with any ideas? Mercedes wants 200 dollars for just diagnostics says warranty voided because of rear view camera I installed. Yes I removed it to see if that was my issue it’s not. Mercedes wanted to looked at dash fusebox that why I’m thinking relay. HELP PLEASE.