There are 8 playfield switchs that score 10. Did you check all 8? For clarity..2 at the sling shots..under the playfield, 2 on the center roll behinds..inside rubber and 2 behind each drop target bank rubber.

Did you replace any rubber recently? Did you remove one wire from each of the 8 "10" point switches? If you manually advance the player unit to player two, does the player 2 10s reel also lock on?

There are 8. The sling shot switches that activate the 10 point relay are under the playfield..one per sling. The two switches behind the sling rubbers activate the sling coil. Glad you were able to find it..it's a classic game. Thanks for the follow up.