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If the board and the sensor has been replaced, it has to be an issue with the wiring harness between the two. Or, you are not allowing ample time for preheating before testing. Are you allowing at least 30 minutes before testing the temperature?
The transformer is just for the electronics. If the sensor circuit is testing good, it has to be an issue with the electronic control. There is nothing else that would cause the issues you are having.
The touch pad would not affect the sensor circuit. It would be the logic board that processes the signal from the sensor.