Looks like you are down to what someone else suggested. Load up the
door and take it to your local door/window shop. NOT a big box store.
You want a shop that actually knows what they are doing.

I was sure that I also had to replace the rollers last week. Being
just out of hospital I called a local handiman type, he came out and
spent an hour cleaning gunk out of the track and from under door.
Rolls easy now, no new rollers needed.

Harry K