Ok, sorry for the delayed update but I was able to fix it quite easily. I recommend anyone having this type of issue to first check behind the dust boot of the door in question. I found the hard plastic tube broken inside that boot. I then found some refridgerator water supply hose and stuck the broken ends of the other tubes inside it and glued it together. All done and more durable than before!

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Problems while owning '99 E430
Continual ABS/BAS problems.
P.S. pre-catalytic convert rusted out at 90k
Ignition key actuation problems.
Gear shifter shift gate issue.
Bad antenna amplifier.
CD changer.
Heated seats never worked.
Biannual air conditioning failure.
Power windows and moon roof.
Leaky valve covers.
Rear power window broke.
Poor rear lamp connections due to bi-metal corrosion.
Maybe my spring perches will fail someday!
Engineered like it's not a car