Suspecting the door is particle board under that linoleum-like stuff. There may be some water damage. In any case, I would just buy a new door. I replace one a few years ago, and as I recall, it wasn't too expensive.
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2010 Montana 3455SA, Mor/Ryde pin, wet bolts, TST 507, Progressive HW50C, GY G614
2019 Silverado D/A 3500HD LTZ DRW CC
B&W Companion
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