Freezer is cold, build ice behind the panel. Fridge above is warm

Brand: Whirpool
Model Number: 535swhzoo
Main Symptom: warm cabiner abive the freezee. Iced behind freezer drawer panel
What happens & when: twice in a month now. It happened before

Error Code (if any): none
Parts or tests already tried: manually defrosted several times, fan in the back is working fine.
Photos / video link:

Sounds like a defrost issue, you will need to test (with a multimeter) the defrost heater and sensor, and if they check good, it will likely be a control issue.

https://www.appliancepartspros.com/repair-help/refrigerator-repair-help
https://www.appliancepartspros.com/repair-help/

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