How to Troubleshoot & Replace Frigidaire AP4362495 / 5304467693 Magnetron (Microwave)

My Frigidaire microwave less than 4 years old was working but not heating. During the actual process it was also making a loud humming type noise Replaced the Magnetron and voila the Microwave is happy again. 

Replaced magnetron. Make sure you discharge high voltage capacitor.. 

Changed out bad parts 

After an appliance repair man failed to repair the microwave, I watched a YouTube video and consulted an electrical engineer to diagnose the problem. I decided to replace the HV capacitor, HV rectifier and the magnetron. I failed to take a picture of the wiring configuration prior to removing them, but obtaining an diagram from online I was ale to feel confident about reconnecting them properly. Thanks to APP having the correct parts in-stock and their rapid delivery, I was able to repair the microwave within a week.