Putting my car into reverse last night, I noticed that I didn't get the extra white lights. I looked at the bulbs a couple of weeks ago and they looked good (never actually saw them burn, though). Of course, I'm planning to open the assembly and check them again, and swap bulbs, etc. but I am finding it hard to believe that both bulbs burnt out at the same time.

I am wondering if there is a typical problem that plagues these units? I wouldn't think there would be an extra fuse for just the reverse apart from the whole taillight, but is there some connection or something I should be checking?

Thanks