Just had this issue occur with the RIGHT light going out. I started a thread for feedback and found this one.

Right light went out a couple weeks ago…replaced both lights with new Weisslicht LEDs… today the same Right Light went out.

I also had a full Hamann perf kit installed a few months ago, front and rear with a lot of custom work done to the rear bumper including removal of the tow hitch and tied up the wiring harness for hitch. My initial thought is it had to be something to do with the wiring, being pinched, rubbed, or tampered with during that mod?

What are your thoughts on how i can diagnose this issue?? THANKS!