IDK if you have your truck repaired to your satisfaction yet, but there is a thread on Cummins Forum dealing with Aisin transmission failure of the K1 clutch drum Snap Ring. From your description of failure mode, IDK if your situation is the same but mbarber84 assembled a spreadsheet of trucks...
I had the same issue when trouble-shooting my HVAC system. I was unable to obtain the "Blue adapter cable" so I ordered some pre-wired OBD components and an empty OBD female shell and made my own "blue adapter" cable. It works just fine.
I found detailed diagrams for this and other adapter...
My 2016 Laramie just started doing the same, cool air out the driver vents and mildly warm air out the passenger vents. After removing the dash center stack, I can verify the two actuators there seem to be working.
I was unable to affect a recalibration as my controls are a single button/knob...
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