I had the same issue with my 1990 240 about a year ago. Fortunately the window always jammed in the up position (drivers door). i tried all the switch cleaning, swapping switches etc etc. One trick was to get a hammer inside the door and tap the motor that worked for about two days. Another trick was to loosen all the regulator bolts and the window stops and reset every thing as it seem to be out of square some how, that worked for ages then everything stopped again. I had previously checked electrics and every thing was ok there.
I even squirted
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