Hi @isabedalhousie ,
Here’s the tech sheet for the microwave oven.
Try performing the Touch Panel and Electronic Control Test as described on p.8 in the tech sheet to see if it shows whether the control board tests OK or not.
According to this link the electronic control part number (part #7 electronic control parts diagram) is 8206313 (and also not available) but I won’t argue with a professional repairer if they said that it is 8206314.
If it is determined that the board is faulty, I did find this repair service that will fix the board but I don’t know how much it will cost you.
If you decide to remove the board to get it fixed, be safety aware when working in a microwave oven. The HV capacitor can store >6000V DC for months, even if the power has been disconnected for this length of time. This amount of voltage can cause serious injury or worse. The HV capacitor needs to be correctly discharged as soon as it is accessible, after the cover has been removed from the oven and before commencing any other work in the oven.