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Hi,Welcome to Just Answer, My name isXXXXX will be helping you with your appliance issue today.
you need to replace the microwave waveguide cover. this is on the inside of the microwave, #5526 on the diagram, its on the right side when you open the door, you can order this for $5.30 @ http://www.repairclinic.com/PartDetail/Waveguide-Cover/1085082?modelNumber=JES1290S thanks Bryan