Electrolux FFTR1821QW1 refrigerator part is staying around 40 degrees, evaporator fan runs sporadic

Refrigerator & Freezer Repair
1

Brand: Electrolux
Model Number: FFTR1821QW1
Main Symptom: Refrigerator area to warm
What happens & when:

Error Code (if any):
Parts or tests already tried:
Photos / video link:

2

Check that the evaporator fan has power to it when it should be running. IF IT HAS POWER AND IS NOT RUNNING THE FAN IS BAD. If it does not have power then it is likely the control.
https://www.appliancepartspros.com/frigidaire-control-box-assembly-5304507171-ap6037540.html

3

Brand: Electrolux
Model Number: FFTR1821QW1
Main Symptom: Refrigerator area to warm
What happens & when: refrigerator part stays at mostly 40 degrees, freezer part stays below freezing. evaporator fan runs off and on mostly not on, not getting power to evaporator fan. Would Frigidaire Main Board Kit W/O MFG Part Number: 5303918900 fix it?

Error Code (if any):
Parts or tests already tried: new 240597203 Refrigerator Temperature Sensor, new light switch 5309918806
Photos / video link: