I do believe it has to do with either the rubber around the door, or the tail light or a combination of the 2... the carpet is damp but not sodden, when i replaced the lights there was a small amount of water sitting on the spare side which had the cracked Tail lens. Is there a part number for the weather stripping on the door?

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hum.....
1987 300TD 311,000M Stolen. Presumed destroyed