High point microwave turns on but has stopped heating

[Imelda]

High point microwave stopped heating - it turns on and carousel turns but food doesn't heat. I understand this could be the magnetron or a high voltage diode. Has anyone had this experience? My Oliver is less than 2 years old so I am wondering if the microwave that was manufactured Sept 2019 is still under warranty. It looks simple enough to pull out and replace.