Steve Kissell wrote:

Last evening while using our seven year old microwave there was a loud
bang and everything stopped.
I determined that my circuit breaker tripped and the microwave would
not restart.

Initially, I thought I detected a black powder residue near the
microwave door, but upon taking it down from the cabinet over the
stove and taking the cover off, I can't find anything that looks
"fried" .

An appliance parts store nearby suggested that I have a technician
(they recommended) look at the magnetron.

Question:
Would that be the circular part about the size of a silver dollar and
3/8 " thick that is located in the base of the oven at its center?

It has two very thin wires coming out of it.

Toss it and buy a new one. It'll be cheaper and safer than a repair.
Besides, they'll have the latest features.