I was constantly having moisture inside the assemblies until I took the caps off and ran a hair drier on high for about 5 minutes right into the one cap hole. I had also parked the car in the really hot sunlight shining right on the headlights. I did em one at a time, and capped them off after about 5 minutes of blowing hot air into it. I made sure the humidity was low that day and after I did that to both of them, it never returned. I have the assemblies that were modified right from purchase (2008 model) so it was the latest assemblies made. I don't know how that moisture ever got into there but it has never returned. If it does, I know how to get rid of it.