We had a technician come to the house to check it out. He confirmed that the magnetron was bad and said he could replace it for $400. I got on youtube to see how difficult the repair was and decided to do it myself. I got on appliancepartspros.com to order the part and to get additional tips and info for doing the repair. The part came in a few days and putting it in was simple. We are back in business for about $175.