Follow up on this thread I started.
Jayco Customer Service was terrific. They suggested I stop by a Jayco dealer, who misdiagnosed the problem as the controller. (In retrospect, they didn't sell or service motorhomes, just travel trailers, but I thought they could troubleshoot for me)
Based on the diagnosis, Jayco shipped me a controller, but finding a dealer on the road who would take me in, was fruitless. I found a great mobile tech in Cincinnati (Bill Moore 513-709-1347) who originally offered to at least get the steps out while we were camped. In doing so, he diagnosed the problem properly as a bad motor. He picked up a replacement and installed it the next day.
He pointed out to me that the step motors are refurbished motors from Jayco's supplier. You can actually see where the original label is covered up by a new one.
Anyway, between Bill and Jayco CS, the problem was solved within a few days of my original post.
2015 Jayco Precept 31UL
Tow: 2014 Ford Fusion SE HYBRID
Blue Ox BX7420 Avail Towbar
SMI Duo "Stay in Play" Braking
Barley, our Golden Retriever, on board and Buster in spirit!