Join Date: Mar 2008
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I would first clean all the shuts and seals with Megs APC with a brush then protect the rubber with Gummi-Pflege. I haven't done this for a few months so I can't say where they are and it's not my car so I can't quickly go and look.
If the car has been parked under a tree or the seals look green this is the first thing I would do before seeing the dealer. It sounds like water is sitting somewhere and only coming in when pointing up or downhill.