It's pretty unusual but I had one get all folded over in my 86, and replaced it. Pretty easy, more or less the same job as replacing a window or any other work in the door. I'm pretty good- I can be inside a door in 5 minutes. The track just required a little pulling and patience. Not real difficult.
The door handle comes off with two screws, then turn it straight up and pull out. The pull handle surround pops off. The lock knob unscrews. The window crank cover pops off, then 1 phillips screw. The door pocket retainers turn 1/4 turn and pull out, the the pocket tilts up and off. A big screwdriver around the outside edge to pop out each clip, and the door panel lifts up and off. 2 push-on connectors at the speaker.
The window track just slides into the groove- you may need to unsecure the window glass to get it in all the way. Watch sharp edges- if I remember right the window metal channel is very sharp.
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Rob Bareiss, New London CT ::: 86 244DL, 87 244DL, 88 744GLE, 91 244: 808K total