Is it set to liberal or conservative?

Idpb only has the schematic. If it was working fine before but acting up now then it’s an adjustment that’s out and not the lib or conservative setting.
Try taking apart the advance unit and clean it to make sure it’s moving freely. The schematic also shows a H.O.T relay that could be cleaned also. I would start there. HowardR is correct, that part of the schematic is very confusing, the logic is very impressive to control game’s scoring.

This reminds me of the inconsistent scoring problem I had with my Aquarius, which was finally solved by replacing what seemed to be a good coil. JethroP contacted me later and said he was having the same problem and that: "So I was reading up on coils that produce residual magnetism, which my P coil did. I tried a piece of electric tape between the metal plate and armature and WALAH, problem solved. The holes are scoring correctly now and the P coil doesn't stick (magnetic attraction) anymore. Yipee." May be the answer for the Advance or another relay.

I think I was distracted for a while by an equally confusing schematic.