Well..here's the skinny. I had two problems. The broiler element had a
short, which is why it would come on as soon as power was applied. But
that short was probably secondary to a relay failure on the control
board, which would "stick" in a closed position once it was closed
(meaning, the broiler wouldn't shut off after the preheat phase). It
would open after power was removed from the stove. But it did make for
an interesting diagnostic challenge, as I thought I had the problem
fixed when I replaced the broiler.

Thanks for the tips!

--Dennis