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253789, AP2024309, WB24X0799.
I had no one to help, so had to build a support to get the over the range top microwave down where I could work on it. That took some doing. There are lots of screws holding the cover on. Not difficult, but a bunch of them. Once I got the cover off it was easy to spot the part. It was held on with a plastic clip that swings out. I marked the old one to be sure the new one went in the same way, based on the labeling. Not sure if that matters. There are six pins arranged in symmetric groups of three. Put it all back together and the error message was gone.