I take it the issue is access to the flue? If so, sorry I can't offer anything for something so new
On my vintage unit, there is an access hole in a cabinet above the refirgerator. I wired a baby bottle brush on to a coat hanger. Whistling, "Chim chimeny chim chimemy chim chim cherooooo...", I ran the "sweep" inside the flue up & down a few times, and decided I had an effective solution.
Strange though: My first thought on your situation would be a clogged pilot light instead buildup in the flue. If nothing else, cleaning the pilot light jet is what fixed my Dometic when I had no cooling.