Ist of all, welcome to the forum!
RE: door closing issues with the W140, these are very common. There are 2 vacuum pumps: one to LOCK the doors (under the rear seat) and one to CLOSE the doors (in the trunk).
Do a search on "assist pump" and you'll get lots of useful info.
That's all I know about W140s!
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Steve
'93 400E
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