Dometic Refer Fridge Portion not Cooling

[Gkaiser]

I did a search to find this issue but turned up minimal.

I have a 2011 Keystone Cougar 328 with a Dometic Refrigerator.
The Freezer part seems to be cooling fine, but the Fridge might get down to a temp of 70. very minimal cooling. It also only seems to work on Gas.

I replaced the main Circuit board. and no change.
The Heating element is giving me a 44 ohms rating.
I have a new Thermistor, but haven't had a chance to install yet.
I did notice that the upper circuit board, If I touch the power switch just right it error light pops up.

I assume I will need to replace the upper board as well. Is there a good way to test this board?

I did read to check for an obstruction by taking the roof vent off.
I do have a very serious dirt dobber / Wasp problem in the summer time around my property.

Just looking for any other thoughts.

[C_Schomer]

Just curious, how cold is the freezer? The refer coil is the tail end of the freezer coil and the sensor is at the end of the refer coil. If the end of the refer coil doesn't get cool enough to cycle off the heat source, the system will,stay on. I'd monitor the system to see if it's staying on and diagnose from there. FWIW, The refer coil is auto defrost, meaning it auto defrosts on the off cycle.
The old fridges of that type nearly always meant, low on refrigerant, when they acted like that, and it nearly always meant an ice-picked freezer coil but you can't do that on these fridges. If the freezer is plenty cold and the fridge isn't, AND the system is staying on... that's likely bad news for the sealed system cuz cooling isn't getting all the way to the very end of the evap.
"Critical Charge" is a term in the refrigeration world and this type of system is as critical as they get! Craig

[2oldman]

See if the coils are leaking.

[dougrainer]

Since you have OHM reading on the 120 element, Wire the heat element DIRECT to 120 volt power, bypassing the rear control board. leave plugged in for 24 hours. Install a small glass of water in the lower refer section. AFTER 24 hours, if that water is NOT below 40 degrees, your Cooling Unit is BAD. Doug