I jumpered 12VDC from my spare Optima, and tried it in both polarities to no avail.

You must REMOVE the electrical motor from the lifting mechanism in order to get everything out.

I removed all the nuts that hold the window lifting mechanism in place and then gently pried with a plastic wedge the stud closest to the electrical motor.

This allowed me enough room to access the closest of the three 10mm hex-head bolts that hold the motor to the lifting mechanism.

Then using an off-center 13mm-wrench between the stud and the door sheet metal as a spacer, I as able to access the two other bolts which are further back.

Once I removed the motor and all electrical connections, I was able to lower the glass, and take out the lifting mechanism.

The lifting mechanism was stiff with old grease, so I cleaned off all the pivot points with brake cleaner, and lubed with ATF and then some bearing grease and Wurth spray grease.

I could NOT open up the motor to repack the grease (looks like Mercedes stamped it shut, instead of bolts) but I did remove the old grease at the motor gear.

After re-assembling and testing, all is good!

However, just like the disintegrating vinyl wire sheaths in the 1992+ engine wiring harness, all the wiring harnesses sheaths in the door were crumbling away. And this is in a DARK environment with just sun heat.

When I have more time, I'm going to re-wrap these cable bundles, especially at the hinge-points, as I see these areas as potential short-circuit/fire harzards . . .

:-) neil