I have a 2013 Black Diamond with 2000 miles. This is my second Avalanche as my first was a 2005. Anyway, I noticed moisture in the third brake light. The service manager said this is normal but, I haven't seen moisture in other Avalanches third brake lights. The service manager said there are vent holes in the lens that allow moisture to come into the light and also allows it to escape. My moisture does not escape and I think there shouldn't be any moisture in and around the electric components. After a few years this could lead to other problems. Am I correct in this thinking? Does anyone have any suggestions?