The replay unit will advance only when Impulse B switch is closed AND the 25c (or 10c) relay is closed The 25c adjustment jack controls the 25c relay. Each adjustment uses a different score motor m/b switch. So the m/b switches associated with whichever jack setting you use would be a good place to start.
Or better yet, put it on free play and be done with it. Sooner or later you'll probably put it back to free play anyway. Coin operating a home game sounds cool at first but it's not what it's cracked up to be.