w126 window problem up vs down

[cth350]

My 85 500sel passenger side front window went down and won't come up.

I just removed the door panel and confirmed power at the connector. But going down it's like a full 13v and going up it's maybe 8 or 9 volts.

I disconnected the frame and pulled out the motor and it seemed immobile. However, when I pulled the motor off the frame and tested it motor works in either direction when it gets the full 13v and goes nowhere with that 8/9v applied.

Where am I looking next and what am I looking for?

With warm regards,
-CTH