Without removing the rail and the window? I don't.
It could be the bits of rubber that hold the window to the lift rail have perished, and the best way AFAIK to fix that is by removing the window lift rail and the window, replacing the rubbers, and reinstalling. 140 lift rails up to 73 are different from 240 and 140 from 74 on. CVI (for one) stocks the lift rail rubbers, or did at least when I had to do one.