Frigidaire fftr1821qw1 refrigerator refrigerator not staying cold

General
1

Please make sure to click on General above and select the correct appliance type first.

Brand: frigidaire
Model Number: fftr1821qw1
Main Symptom: refrigerator part not staying cold
What happens & when: top freezer stays cold, evaporator Fan runs very little if not at all, no electricity to the evaporator fan.

Error Code (if any):
Parts or tests already tried: put on a new 240597203 Refrigerator Temperature Sensor, and Refrigerator Light Switch 5309918806
Photos / video link:

2

Take a look at the evaporator coils when the refrigerator is running. Is there a frost pattern from top to bottom? If that looks good, do you feel the refrigerator is running long enough? With the sensor already replaced, the main control would be next. When the compressor is running, the evaporator fan should also be running.