Virgil B Glenwood , IN March 10, 2015 Appliance: General Electric Free Standing Microwave JVM1631WB003 Ge Microwave Jvm1631wb003: No heat. How to replace Microwave Magnetron Assembly. Replaced three year old magnetron with a new one , i got 10 years out of the first one but i cook more with microwave now . Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes