The picture looks like the roller bed has some rough surfaces and those need to be smoothed. The rollers are probably shot as well and replacing them along with smothing the roller bed ridges will help a lot. Those doors are REALLY HEAVY so if you're not pretty good with heavy, bulky things, then best you leave all that to one of the contacts given above. I did mine and got another couple of years use before replacing the entire door system. But - wow, those doors are REALLY HEAVY and a pain to move around.
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