I recently found water in the wheel well and someone suggested the high level brake light but in removing the trim at the edge of the roof I found that it was held on by 5 poppers one of which fell out so may not have been in its hole from day one .The others came out so easily and the dirt behind the O ring seals shows that these are not 100% effective so I have cleaned and sealed in with silicone hoping that I have found the problem.I would advise checking this