How to Troubleshoot & Replace Whirlpool AP6015387 / WPW10126786 Magnetron Assembly (Microwave)

I first began troubleshooting by checking the diode. The high-voltage diode unfortunately does require a ohmmeter that has the capability of utilizing more than 9 V. The trick is to put another 9 V battery in line of the leads. But just to be sure I ordered a diode just in case I was wrong. I also ordered hey capacitor and high-voltage transformer just in case I was wrong as well. My first suspect was the Megatron and that is the first item I replaced when I receive my parts and bingo that was it. Interestingly enough, the magnetron looked absolutely in good shape when I pulled it out but I guess since it is a tube it can fail. Ohm meter measurements revealed no issues at all. 

We purchased the magnetron and replaced it. It was actually pretty simple just take off the back and unplug the old one and put new one back in and put the back onto the microwave and plug it in and it works great! 

Found the part that was correct for my unit. Ordered it and it came within 24 hours. Very easy part to replace. Most appliances are repairable with average mechanical skills. 

Replaced the magnetron. 

Replaced it with one of your magnetrons. It works now! For a lot less than a new microwave.