build up track at one end?

A quick learner from St. Petersburg Florida says:
I would like a suggestion how to build up one end of the track at one end before putting on the 80-103 track cover. The track is not so much in bad shape as that it is way out of level at one end which causes the wheel to jump out of the track. Thx.
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Paul Sr. from SWISCO responded:
If the track is fine but is not leveled, remove the doors. Remove all the screws from the door frame and with a flat bar, lift the part of the track that is sinking. With a flash light, look under the track and see if the wood sill is rotten. If it is rotten, you will have to remove the door frame and install a new wood sill. If it is not rotten and is just sinking, you might be able to shim up the sill to make the track leveled again. Then re-install and maybe add some caulking to the sill to prevent any future water damage. Install doors and adjust them to roll smoothly.
A professional from California says:
Have you tried adjusting the rollers? Sometimes if a roller does not have enough adjustment, you can buy one with a larger wheel for the low end, or find a similar roller that is taller. Sometimes the reason the door hops off the track is that it hits the back end unevenly. Try putting a bumper in the center to eliminate tilting of the door when it hits the frame.
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