I'm not an appliance repair pro, just an average homeowner. But I'm not against picking up a screwdriver if I think I can save $100-200 by changing out a simple part on an appliance.

My Panasonic microwave (Genius 1250W model NN-T945SFX) was doing the same thing. I unplugged it, took the cover off (had to get a special driver - star pattern - at Home Depot to get it off) and found the door latch was received inside by an assembly called a Door Hook (Panasonic part # F30201200). This door hook has 3 electric relay switches on it. I took out the door hook with the switches still attached. To do this I had to slide off the wire connectors to each switch. Then I removed two screws and out came the door hook assembly.

A visit to my local appliance store let me get new switches all around - they were $6 each. Better than buying a new one, I'd say. Now the microwave runs again.