After a decent rain yesterday and this morning i notice that i had some water spots on my rear seats. Looked up and notice that upholstery near corner the roof and rear windows was wet where the wire from the onstar run too. Check the other corner on the passenger side back and notice that was wet too. the middle of near the rear window was basically dry. Do you guys think weatherstrips from the rear windows are bad or maybe a problem stemming from the sunroof where water is leaking backwards since i was parked in a steep hill backwards.