Quoted from DavidPinballWizz:For the well walker: double check the z-connector that connects the wires of the well walker switch to the main wiring loom.
My problem was in my first walking dead related that connector, and on my second machine the exact same thing.
I ended up with swapping that small connector with another one (from somewhere else in the game) and all was solved.
But of course, a too sensitive switch is certainly an option too.
How the heck that connector causes false well walker hits is beyond me, but sure enough I swapped it out and everything appears ok. I would never have thought to do that, so thank you so much for figuring this out!!!