Thought I replied to this last night!!!! Anyway, thanks. That was my next question.
I did get the bulb installed today and all is well. Turns out there's some water leak into the housing - very small but there's some going in. Couldn't find source, but did find out that the fog is a 3-piece glass unit. Center glass is glass but plastic on both left/right edges. The leak could be through the interface between glass and plastic. Won't worry too much about that for now.