My only question is: When is parts replacement as a troubleshooting technique finally stopped, and why and how?
It seems almost everyone climbs on, and goes down, this Slippery Slope.
I guess I am not a gambler. Maybe it has to do with gambling small amounts at first and then betting the farm on the control board.
What holds me back is that I know it could be something as simple as a corroded connection that could be fixed with fine sandpaper, parts cost = zero.
And using a $20 multimeter considerably narrows the choice of what is wrong.