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Hello Peter,
Those motors are pretty rugged and durable.
It is very possible your driver door switches are the problem. If you haven't removed them before, you must remove the door handle in order to remove the switch "block" that contains all of the switches at the driver's door. IIRC, you must also pop loose the lower half of the door panel to make the removal easier. It is not difficult, but figure on a good hour or so to pull, clean, and reinstall the five driver door switches. Don't feel bad if it takes a good while longer.
After pulling the five switches - (labeling their positions is not necessary, you can match them to the correct plug connection easily enough, and most if not all are interchangeable) - lay them out on a clean cloth inside of a TV dinner tray or something similar, and disassemble one completely. Study how it all works together, then clean it thoroughly. Q tips and tweezers and contact cleaner are very handy here. After thoroughly cleaning the contacts on the inside, stretch the tiny spring an extra 1/16th inch or so (be very watchful here). Do not apply lubricant that will become "sticky" over time. A smooth graphite *might* be a better lubricant choice for this than oil/grease, use your own judgement. Personally, I did not use any lubricant inside the switches.
If you discover the switch is inoperable, you can "switch a switch" from one of the rear doors...they will be almost new since they are normally used less frequently.
I have done all eight switches on my 85 244 GL, and completely restored the entire system to perfect operation (nice firm switch control) in about two hours of kitchen table work.
Be glad to help if you have any switch questions. As for wiring and motor problems, I fumble along with the best of them. :)
Good luck!
Jackson..."Totin'da Load" in North Carolina!
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