GE Profile Auto Defrost Problem

I’m having similar problems with GE Profile PFSF2MIXBWW bottom mount freezer refrigerator. Auto Defrost seems to have gone nuts. When working properly, it can hold 0F freezer / 40F refrigerator. But then it goest to 55F/55F freezer / refrigerator. Thermistors and heater resistance check OK. I have replaced defrost thermostat - no difference. I replaced the control board earlier after a hard failure - the entire unit was not running.

Have you found a fix?