Thanks for the reply. I used to see that a lot on the pre-electronic ranges, but it's been so long I had forgotten about it.
The customers would call with "I hope you can fix my stove, all the eyes work, but the bake and broil just quit" and that was when I'd say, "you just cleaned around the knobs and controls didn't you"!
I started doing service calls in the early '90s and stopped last year about this time when the Covid 19 started to be a thing. I had passed my 76th birthday - it was about time!
Thanks again, John