How can I repair my Panasonic Genius Sensor 1250 watt microwave turntable?

Hello!! I recently purchased another Panasonic microwave to replace my 22-year-old Panasonic. :)

It's a great microwave, except that the turntable just stopped working. Really. One night it worked, and the next morning it didn't. No smoke, no slowing, no power surge, nada. It just quit. On my old one, I just replaced the fuse. I'm not sure what to do with this one. Any ideas?

Thanks!
Laura