I agree with above, if it came off the track, this may be a simple adjustment of the tracks, or replacement of the wheels, or adjustment of the wheels. If this is a hinged unit or one that is on pins, there may be screws that came loose. If you can determine the manufacturer, you should be able to get the original installation instructions that will provide lots of info, and you may be able to find another installer to fix.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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