Need help with microwave repair

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I have a GE spacemaker XL1800 microwave (JVM1840CD) that has stopped working. Before quitting completely, I could open the door and the fan would continue running. The timer would count down, but neither the fan nor the microwave would operate when the door was closed. I have replaced the transmitter as well as the high voltage transformer to no avail. Any suggestions are appreciated.
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