After all the rain we had here, heard water sloshing in the rear passenger door. Pulled the vapor barrier, found the glue was weak in two spots and the drain opening in the corner of the door was blocked by a piece of tape or similar. Cleaned the gunk off of the barrier and the door and re-sealed, no more problems after more rainy days.

 

What did you do to fix the glue? For my E46 I went to a roofing store and picked up a roll of butyl tape and I think it worked fine to seal the vapor barrier back on.

 

3M General Purpose Adhesive Cleaner and lots of elbow grease to remove the gunk from the door and the vapor barrier, re-seal with 3M Windo-Weld Round Ribbon Sealer.