2002 driver window stuck/jammed all the way down

Anybody have any suggestions on how to encourage it to move? We just want it up, don't care if it works. I'm the schmuch who borrowed my buddies truck and put the window down, apparently it doesn't work...... So we got the panel off and have no access to the rivets to replace the regulator properly (because it's all the way down of course). I've tried pulling up with 30-50 lbs of force on the arm with no luck, glass cones up about 1/2 inch and everything jams. My guess is something stuck in the gear train maybe? Or maybe the motor just sucks and won't freewheel. I confirmed +12 and-12 for up/down.

Anybody have any suggestions on how to encourage it to move? We just want it up, don't care if it works. I'm the schmuch who borrowed my buddies truck and put the window down, apparently it doesn't work...... So we got the panel off and have no access to the rivets to replace the regulator properly (because it's all the way down of course). I've tried pulling up with 30-50 lbs of force on the arm with no luck, glass cones up about 1/2 inch and everything jams. My guess is something stuck in the gear train maybe? Or maybe the motor just sucks and won't freewheel. I confirmed +12 and-12 for up/down.