My company through out this Microwave because fear of radiation and was resdued from a dumpster, after watching repair video regardiing problems with door micro switches I decided to
order and replace both door swiches. Taking the cover screws off you will need T20 Security Tee star driver which cost ~ $4.00. Once inside the door bracket was remove with three screws.
Care was taken when removing defective and when replacing new micro switches in order that
plastic tabs were not broken. After both micro switches were replaced and cabinet was reinstalled.
I ran unit and opened the door and it stoped! I now have a great working microwave for a repair cost of about $40.00 that otherwise was going to be trashed.