Quoted from VolunteerPin:
Thanks for the suggestion. Actually, none of those coils are firing which I didn't realize before. All of the wires seem very intact with some pretty generous tugging. Where to look next?
The switches on the slings tend to get mashed together over time. Remove the plastics and adjust them so they have a slight gap when the rubber is one but the ball isn’t hitting them.
You can use the switch test in diagnostics to see them firing as well.