My buddy at the bone yard said that he can fix these motors by replacing the bearings. I'm going to get the info., and post it later
In the mean time, try taking the inside door panel off and do what I did. Pour oil down on the top of the motor. There is a little recess in the door frame on the top that makes it easy.
When rolling mine up, there were 3 places where the window slowed down a lot. I lubed everything. Pouring oil on top of the motor is the only thing that worked.