Yes I do think it is related to adhesive. All the door panels are doing this. I thought about drilling a small hole from the inside, spraying say a headliner adhesive all around, heating the entire area and then sucking out the air with a strong vacuum source .....

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)