Here's an update!
Had a mobile guy come out today & pull the wheel off. Found the electro magnet was worn and the spring on the bottom was stretched, & the bearing were almost dry. Had him replace the whole assembly & repack the bearings. Did not look at the other three wheels since they were not giving any trouble. Will have it in the shop within 700 miles for a checkup.
I watched him do the work, so I think I can do the work the next time.
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