Just a quick update. The black control box finally arrived late yesterday afternoon. It had been on back order for over a week. The part itself cost about $45 but Lippert charged about $20 for UPS ground shipping and handling. I thought that was a bit high but what can you do. Very simple install. It took 10 minutes. Now DW chair reclines. She's a happy camper.
This was a much better way to deal with issue. It took 2 weeks from start to finish. The 5th wheel stayed in the garage at the house protected from some of the bad storms we have had recently. If I took it to the dealer, I would have to drive 140 miles round trip twice, it would be there for at least 2 months before they could get to it, then probably charge me way more than $65. Life is good!