2008 GE sensor microwave. Sensor error and...

Ge sensor microwave WES1450DM1BB Display indicates ''Sensor error'' and it won't heat. Which sensors may apply and where located?

Can repair myself if I can get the specs.It is one month out of warranty and the maker has refused warranty. My wife and I are elderly and disabled on a very low income, so we must fix ourselves or go without. Cannot afford the quoted $45 plus parts because we are so poor, and we cannot work.

Yes, I know about the charged capacitor and how to discharge it.

Thanks for your help!