Replace both front door vapor barries...and any other door that is missing.

I would also pull the front A-pillar trim pieces and inspect both the front sunroof tubes. They are frequently kinked and/or the tube has pulled out of the lower drain pipe..

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'99 E39 528i 5-speed 130k
'06 325Cic auto 115k
'05 X5 3.0 auto 173k-SOLD
'03 530i - manual swapped - 430k miles-SOLD