Raibourn
Not sure if the AC problem has been cured. We own a 2017 Aria 3901. Our AC would seem to work for a short time and then be warm. In the front of the coach, to the left of the generator is a small radiator looking part of the AC system. It has an electric fan on it which was not plugged in. I had to cut some wire ties in the harness nearby to find the other end to plug the fan into.
When you turn the AC on do you hear that fan screaming? It's real noticeable.
Hope this helps.