Pulled the rear door trim panel because the window was jamming and found that the problem is not at the bottom of the glass but near the top. At the rear of the window is a round hole that fits into a "guide". (See figure - item marked 7-5-9). Mine has broken (was able to rerieve one piece from the channel).
My limited parts manual does not list this piece.
If anyone knows of a way to repair that does not involve removing all of the glass, if someone has a part number for this piece, or if there is an aftermarket part that will work, I would really appreciate knowing.