An update on our furnace issue.
In short - problem solved, but have no idea how.
Dealership had removed the furnace and did extensive bench testing under the direction of Atwood, with all tests showed proper furnace operation. Then after re-installing the furnace the dealership was in continual contact with Jayco providing Jayco with results of additional requested test, measurements, etc.
While the dealership was waiting for a response from Jayco on the last information sent them, we picked up the trailer for a planned camping trip.
During that camping trip, the furnace worked fine without any short cycling that we experience previously.
We've been out twice and both times we used the furnace extensively, with no issues.
My only guess is that the removal, bench testing, and re-installation of the furnace resolved the issue.
Could have been a slight kink in a duct, or something similar that was resolved when the furnace was re-installed.
Thanks to everyone who provided comments and suggestions.
Happy & Safe Camping.
2015 Jayco Eagle Premier 361REQS
2014 GMC Sierra 3500HD 4x4 CC D/A