@timbow15
Disconnect the power to the oven and then remove the cover and check if there's a wiring diagram inside near the control panel.
Having this will help you to find out what's wrong
Be safety aware when working inside microwave ovens. The HV capacitor can store >5000V DC for months even if the power has been disconnected from the oven for this length of time. This amount of voltage can seriously injure you. The HV capacitor needs to be correctly discharged as soon as it is accessible after the cover is removed and before commencing any other work inside the oven.