Looking for any advice on fixing this problem. I have a 1993 300E sedan 3.2L engine, engine code 104.992. My problem is no power to my drivers side door. Door does not lock, but actuator still functions and locks all other doors. Dome light does not come on when door is open as well as the lower light at the bottom of the door frame. No warning buzzer sound when keys left in ignition with door open or headlights left on. Power window and side mirror work perfectly. When the passenger side door is opened the dome light works the warning buzzer works and so on. Things I've checked: fuse,all are good. Door switch button, moved passenger side to drivers side and the switch worked fine on passenger side.
Again all three other doors work, locks and lights. Any help would be greatly appreciated.

Check that the vacuum line has not come off or the rubber hasn't disintegrated

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The door switch would explain the lights and one of the buzzer issues (not the headlight one). If the switch itself is good, it sounds like it must be disconnected somewhere.

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Prost!

Would the door switch problem be why the door does not lock as well?