I just went to SC for the same issue. My local SC will no longer replace tail lights for bugs in them under warranty. They said that the design of the "vented" tail light would never prevent bugs from entering. So then I asked them to take it off and see if they can get the bugs out, and I'll pay for the labor. But they refused. Basically told me that there was nothing they were willing to do. I took the tail light off myself and was able to get the bugs out. It was the trunk light, so it was kind of a pain to do, but the reward was worth it. Thanks a lot Tesla.