If it's a Schwintek it's possible one motor went bad, or something is binding just one side. As suggested, look for the controller, sometimes mounted inside a storage bin upside down on the top, and Google for the codes.
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--2005 F350 Superduty Crewcab, 6.0, 4wd, short bed, 3.73 gears;
--2016 Montana 3711FL, 40'
--2014 Wildcat 327CK, 38' SOLD
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