Both Freezer and Fridge are not cooling

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Brand: GE
Model Number: GSF25IGZBBB
Main Symptom: Not cooling
What happens & when: Both the freezer and fridge is not cooling but it is turning find and we can hear that everything is on and running. Any first steps on the issue

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

If the compressor is running and all the fans are working then you’ve got a sealed system issue.

I was looking to replace Defrost Heater and Bracket Assembly WR51X10055