First I emptied and cleaned out the entire refrigerator. Then I unplugged and defrosted the unit. As that was happening, I vacuumed out the back compressor area. ( the noise reduction pad disintegrated so replaced) , Googled the problem, and watched a youtube video on how to test and fix the issue. Took the back of the inside freezer compartment off and metered the heating coil. It was good. Then popped off the control panel cover in the fridge compartment and tested the motherboard. Nothing. So I ordered the motherboard and pad, it came a week later, installed, and it’s working great! One little issue - the motherboard was scored but would not separate. So I scored it, very carefully, deeper. Beats shelling out bookoo bucks for a new one. Thanks AppliancePartsPros for the fast service and great price.