Shawn D Manchester , CT December 07, 2014 Appliance: General Electric Free Standing Microwave JEM31CF001 Ge Microwave Jem31cf001: Bad magnetron. How to replace Magnetron (Microwave High-Voltage Tube). Used troubleshooting technics to determine the issue, found magnetron bad and replaces it Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes