DKLilly67,
Glad to hear all is well. Kudos to you for your persistence and for posting your solution. There have been many posters who never post the solution and that just leaves everyone hanging, without us being able to learn of the problem. Posting your solution can potentially be helpful for others in the future who have similar issues.
I would recommend that if there are any other screws on junction boxes or breaker panels, that at some time someone go around and make sure they're all tight. This includes ground wires for the DC side of things as well. It's possible that the screws can loosen up over time, even on house wiring. In an RV that's bouncing down the road, it's even more likely for the fasteners to loosen with age. A loose connection will generate heat and ultimately create electrical problems.
Again, thanks for following up with your post! :)
~Rick