JT5500SF3SS Upper oven heating issues

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Brand: GE
Model Number: JT5500SF3SS
Main Symptom: Upper oven doesn’t heat
What happens & when: Initially, I was getting a F code when cooking in the upper oven. I replaced the thermostat. No change. Then I replaced the control board. After replacing the control board, the upper oven no longer heats. I checked the heating element, and it passes a conductivity test.

Error Code (if any): None
Parts or tests already tried: Thermostat, control board
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