Dacor DCM24S convection microwave not heating (neither microwave nor convection)

[AndrewSD]

I have a Dacor DCM24S convection microwave.  Both the microwave and the convection heating stopped working at the same time.  All the other functions appear to work just fine -- the light, turntable, control panel, etc.. Any ideas on parts that would explain this?

I found the service manual here: https://www.manualslib.com/download/898193/Dacor-Dcm24b.html.  I feel like I should be able to figure out the next step based on the schematic S-1 (attached to this post), but alas I'm not quite there.