We have a 7-year-old KitchenAid (Model# KRSC503ES00) side by side refrigerator. The refrigerator section temperature fluctuates. It will be 50 degrees for a few days and then it returns to normal temperature in the mid 30s for a couple of days. The freezer section works fine.
We had a tech look at it and he gave up.
I have replaced the control board and both thermistors in the refrigerator section. This model has one compressor and condenser which provides cooling to the evaporator in the freezer section and the evaporator in the refrigerator section.
Any suggestions on what else to look at?