No heat Microwave GE XL 1400

The heating unit, I guess the magnetron has quit, everything else works well but no heat. There are no special circumstances, just didn’t work one day.

Is there a way to confirm that I need a magnetron and a way to find the access to remove? Also I scanned posts before posting and looked for the parts blow up. The model number comes up as a table top unit but this is an over the range model. It is not within the GE period for underperforming magnetrons as it was made in 2001.

Thank you.

Thank you for the time you took to answer my question, it is appreciated.

Dave