Actually great thinking. Thank you.
I examined carefully the door bottom for broken pieces. Found none.
BUT, moving the window down to a hole in the channel, I noticed that the cable has a piece crimped on it that fits into that clip that moves the window up and down. That did not look right. Sure enough, using some needle nose pliers, I found a piece broken off of it. Eureka! Now I know how to fix BOTH windows.
Hard to keep up though. Had a coolant leak. Had to replace the expansion tank. And noticed that the fan shroud is broken. Have one now but have to get the fan off, RH or LH? Also noticed that the 2 front outer boots are split. Just repaired the outside door lock and the MID. Hard to keep up. Have to pull the engine on the Audi S4 to replace the turbos (just rebuilt the manual 6 speed) and the Audi A6 needs a valve body rebuilt on the Auto transmission. One day at a time! And daughters Volvo won't start. And garage door just stopped working. The screw drive plastic block striped.
Pulled the motor connector on the window motor in case the wife gets a brain freeze.
Must be 2 of these blocks on each window?
Thanks again.

George
Hoover, AL
2002 X5 3.0L