An Idea
We had a similar issue, and found it was caused by the individual sections sliding from side to side horizontally. Here's what we did to fix it. Take the flexible "door" out of the head, and then lay it down on a flat surface and align the ends of each individual section so everything is straight. Next apply two vertical strips of duct tape or similar tape of a generous width on the backside of the "door." This will help keep the whole thing aligned and a bit sturdier. One vertical tape strip on the far left, another on the far right, on the BACK of the door.
Once you have the door taped correctly, just look under the sink and you'll see that the track for the door take the form of an upside down "J" So turn the door upside down, and with the taped back sections facing you, just insert the door upside down into the track and it will turn over itself and come down like a garage door along the rest of the track into the right spot.
We have a 1993 35s5. She came with flexible cabinet doors that close the head closet and under-sink cabinet. These are metal slats that are linked together and slide up and out of sight via narrow tracks inside the cabinet. The door has fallen out of the track and we'd like to reinstall it. I have tried, to no avail. Is anyone famililar with this type of cabinet closure and do you have any hints of how to get it back into the track?
Thanks for your help.
Stacy