Don't know if you resolved your window problem yet, but over the years, I occasionally have had an individual window that didn't work on my '84 190D - typically, it is the driver's window. Every time, it was the switch in the console in between the seats that was the source of the problem. Removing the switch from the console and opening it up is pretty evident just from examining it. If you've never opened a window switch up, just be careful to do it over a plate or pan because it contains parts and small balls that may fall out if you don't hold it upright. I simply cleaned all internal parts and put it back together, and that fixed the problem every time. Whenever I have a problem with my car, I always start with something simple initially. My car is 34 years old and all the regulator motors are still going strong. Good luck with that!

__________________
Baby Benz Sandra

"We must all hang together, or assuredly we shall all hang separately." ... Benjamin Franklin

1984 190D 2.2 W201 Baby Benz:
290,000 miles and still going strong; my daily driver
Motorcars of the past:
1973 Mercedes-Benz 220D
1973 Porsche 914 2.0
1969 Volkswagen Bug (Bought it brand new in '69 - the list price back then: a mere $1799!!)