I have a 2018 redhawk 31xl. The last two camping trips I have been getting excessive condensation in the refrig area. I always run the refrig on electric. The ceiling of the refrig section is literally dripping. The excess runs out the bottom when I open the door. The refrig and freezer sections seem to be operating normally. I keep the system on the middle cooling selection.
When not using the RV, it is plugged in with the refrig off and propped open.
I am suspecting you have a door gasket is not fully sealing.
You an check using a narrow piece of paper to test. There are lots of videos on the subject. A well used dollar bill due to the jog would be better than a new crisp bill.
Does either the top or bottom plastic door hinge support look like it's cracked? That's a known problem with some refrigerators, and that could cause a door to become misaligned, affecting the seal.
__________________
Bill
2011 Dodge Ram 1500 HEMI Quad Cab
2011 Jay Flight 26BH