Oven buzzed and no heat

First took down the hood/microwave and removed the sheet metal housing.
I changed HV diode as it was the least expensive component and the first one that internet suggested and tested bad with a ohm meter. Didn't fix a thing.
Capacitor failed test with meter so I ordered and then replaced this.
Still no change so I ordered a new magnetron.
Now I have over $100 invested in a 9 year old oven but a new one is three times this so if my time is free I am still ahead.
The magnetron may be the first part installed onto the oven. To remove the old magnetron and install the new the top plastic vent hood moldings and motor had to be removed. Pretty straight forward but not a little amount of work.
The new magnetron did the job and the oven now heats like new.