I doubt the tracks are bad, as the wheels typically fail first. I did google this subject some time ago, and these are fairly easy to remove, and the local hardware stores care the replacement parts. I typically do my own work, so I do not have a recommendation for a person to repair these. Just be careful that you are not over paying for the repair.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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