Mine kind of stopped and started like yours. One day it worked, another it didn't. Then one day it went down and wouldn't go back up. It seems to me that I got an aftermarket motor and the rest of it for like $90 shipped. While it was cheaper they did send me the wrong side first.

Anyway, there was a video of a factory tech that I found somewhere. It was supposedly off the DVD. There are also pretty good pics if you search on this site as well. Of course there's also the MB W210 Door Trim Removal tool. I think it costs $10 but it is basically a round tipped flat piece of plastic that gets thicker towards the top. After you removed all the screws in the door just slip the thin end of the tool in and move around the door till it stops. Twist till you hear a pop and move onto the next one.

The first rivet broke my rivet gun so i went with stainless screws and nylon (airplane) nuts so they wouldn't shake loose.

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Andy, North Jersey
1999 E300 TurboDiesel 116k miles