Update #3 - Problem resolved - Please Read
Just had my 2021 Alpine repaired.
NOTE TO ALL: Poor manufacturing problem as noted by Lewis RV in OKC By Keystone!
Too much Spray insulation under both AC plenums blocked return air flow.
Also, foam board insulation within top of return air duct sagging down restricting airflow. Dealer noted same issue on multiple units!
Dealer had to pull AC units and also remove inside ceiling panels to repair.
Result plenty of air flow and cooling from both units.
Inspection technique by me was an endoscope (Amazon) which allowed me to view ducts on my iPhone via Bluetooth.
If having low airflow on new Keystone units, better check.
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