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By chance are these "dark spots" around the lower edge of the baggage doors? If so, Keystone had issues with browning of the doors in the 2010 - 2016 timeframe. No fix other than paint or replace. Your rig is probably "filon" sided which is fiberglass reinforced polyester. If my above guess is not your issue ... have you tried light rubbing compound on an out of notice spot?
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