Why Is My Freezer Not Defrosting Whirlpool Fridge French Door Ice Maker

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I have a Kenmore/Whirlpool refrigerator/freezer (bottom-mount freezer) - model # 596.75232404. The freezer is frosting over and doesn’t defrost. I replaced the defrost thermostat and heating element. Even when I put the appliance into the Forced Defrost mode (both Short & Long cycle), the freezer does not defrost. Does that mean that the problem is the main control board?

Three possibilities: Defrost heater assembly Defrost Thermostat Main Control Board here’s the part: https://www.repairclinic.com/PartDetail/…