The refrigerator and the freezer both will not control to the set temperature. Both generally are much lower than the setting. I have the refrigerator set at 38 degrees and it generally shows that the temp is 29 and it is below freezing because food freezes. Does the thermostat need to be changed or do you think it is the electronic control that isn’t sending the correct signal?
Most probable problem is the thermistors, fresh food one part of the damper wiring harness, the other in the freezer bottom, AP3185407, should measure 16 Kohm in ice water after 5 minutes, a slim, white, plastic item.