Is this GE Microwave worth repairing?

Everything on the microwave/convection combo is working except the microwave will not heat and makes a loud humming noise when it is running. Is this something I can diagnose and fix?:confused:

More than likely the magnetron tube has failed. Over 10 years old, you are out of warranty for the part. So you would be looking around $400 to fix from a repair company. You could do it for less than half of that if you have the right tools and alittle knowledge of what your doing.

I am pretty handy with tools. Is the magnetron a part that can be ordered (if so, where) and what does it look like? Do you know of a website that will give me instructions on how to replace it–maybe with diagrams or photos?

In order to replace the magnetron you have to remove the microwave from the cabinet.

Gene.