Power window issues

[19 69 GTX]

Ok got a 69 gtx with power windows. Car was totally restored nut and bolt. Both front windows work fine but back left is really slow but got it all the way up. Biggest issue is back passenger window it's down and won't move at all. What's best way to go about getting it up. Obviously I'll check to see it it has power first which I'm sure it does. Is there anyway to get it rolled up. Thanks for help

 

[68BabyBlue]

I have a similar situation with my restored '69 GTX. All window mechanisms were redone with new parts. Problem is the car was only driven 1000 miles in the 28 years before I bought it. I had one of the rears stick like your car, and it came up fine when I gave it a little help by hand while putting power to it. I drove two 1960s Imperials with power windows as daily drivers 30 years ago, and had similar problems with the rears. I ended up removing the window motors and loosening up the hardened grease with WD40. They all worked fine from that point on. I'm not motivated to pull the interior panels on the GTX, so I've been trying to run all the windows during the summer when the grease is at its most fluid, and they work better now.