The F3 error is a temperature sensor error, and the F7 issue is a keypad issue not a control board issue, the f7 error is a communication error between the keypad input and the main control board, sometimes as you have done cleaning the ribbon contacts between the two will solve the problem in instances where this continues to be an issue the keypad must be replaced to completely resolve the problem.
As far as the f3 error is concerned you can check the resistance of the oven sensor by removing it ( it's the probe you see sticking out the back of the oven, you can remove the two screws holding in place pull it out unplug it from the wiring harness and check the ohms of the sensor, it should be around 1100 ohms at room temperature if its not then it needs to be replaced. If it is good then it may just be throwing that error because of the f7 error. Let me know if you have any other questions, thanks.
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