just reseal them as per chris's guide
I have had no issues since resealing
it really isn't that hard to do
probably takes longer to dry out on the radiator
I just dont see how moisture could get in after sealing with mastic but after a few weeks out in the rain one has slight condensation in the very corner. I give up. Thats it they win.
When you seal them up, do you put a little mastic or silicon around the rubber seals where the bulbs go in? All I can think is maybe its getting in there? I suppose the other option is to ventilate them better and not completely sealed up. Don't know, but I to have this problem and will be looking at it when the sun comes out! What ever that is was... Ucking weather!