[Sea Note]

As you enter the coach there is a black plastic cowling about 1/3 of the way up the pole the door swings on.  The cowling covers the mechanism that controls the door movement. After a month in Moab's dust last year my door was sticking so I removed the cowling, blew everything out with compressed air, and sprayed it out with quick-dry lithium and no more sticking.  It took some gentle nudging to get the cowling back on properly as I didn't want to break it. Perhaps that will work for you.