47-55.1 power window problem

[nvrdone]

I've had power windows in my '49 for a number of years. Recently I've noticed
that both windows go down at about the same speed as my DD's but go up really slow.
So I took the whole door apart and cant find any problems. The glass runs dont show any wear and I cant find anything binding. I've lubed everything with spray on graphite and still no improvement. I even left the mounting bolts loose and ran the window up and down. No change.
Any thoughts would be appreciated.