One thing I found with mine is the balance between freezer and refrigerated compartment is very hard to determine and balance out. I temporarily put in two temp controllers just for the displays. Took a couple weeks of minor adjustments between the freezer control, which is where the evaporator is and is just an air flow control and the refrigerated compartment, which gets the excess cold air from the freezer.
This fridge, a Kenmore, has a problem sometimes. It will only cool to about 45f in the refrigerated compartment. If I were to adjust the temp control colder it was already a closed switch and still would not go below 45f.
Took the wire harness apart at the connector, reassembled and all works fine. I have to do this about once a year. Apparently one of the pins in the connector is wonky somehow. All I do now is take out two screws, drop the control piece and unplug it, plug it back in and good to go for awhile.