Are they maybe the 16x parallel 'reels not at 0' switches? Near top left of the schematic usually? What game?

That's a zero position switch.

It should be open at 0 and closed the rest of the time. You'll find it in the circuit for each reel. Look for the coil for that particular reel, it will say something like Player 1 100-900 unit, and you'll find that switch in that circuit, usually right above a switch that says reset relay on it. That switch will only come into play during reset when the reset relay is activated. Is the game resetting properly?

That switch missing would mean that, if every other reel was already at zero but that one wasn't, the game would stop trying to reset

The individual zero position switches are in the circuit for each individual drum unit. That's where you'll find the wire color etc for each one.

I have a similar question for the group. I'm working on a Captain Fantastic and found this situation on the player one 1,000 and 10,000 reels where the same switch is bent back so that it never closes. I think the digits were all resetting correctly when I tested prior to starting the restoration.
Here's how the switches look:
When reel is at 1 -> 8 position:
IMG_9333 (resized).JPG

When reel is at 9 position:
IMG_9334 (resized).JPG

when reel is at 0 position:
IMG_9335 (resized).JPG

I'm thinking I should adjust them so they make contact. Question is should I if everything appears to be working correctly?
What's the impact if I don't adjust it?

You're probably going to run into the same situation I described above. Try setting the game up so that all other reels besides those two are at zero, and those two reels are at 1, then start a game, see if those reels reset.

Personally I'd adjust them back, then see if that causes issues, then fix the issues the proper way, whatever they may be

bally score switches (resized).jpg

Thanks for the quick reply, zacaj! I've adjusted the switches to spec. I bet it will be fine. Parts are coming for the playfield restoration. Once installed I'll give it a test!
Thanks