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That part is accessed by removing the complete outer cabinet from the microwave after removing it from the wall.
The link below is to the part you will need from a highly recommended company rated A+ with the Better Business Bureau. They offer a 100% money back guarantee, EVEN ON INSTALLED ELECTRICAL PARTS, for an entire year! They are the only company to allow returns on installed parts for a refund and offer a FULL ONE YEAR WARRANTY!
Considering the age and the cost of the part, it may be wise to consider replacing the microwave....
Please let me know if you have additional questions or need clarification.Thank you so much!