Quoted from southofi-10:...
I can also say that even when the step up on the replay unit is at the end where it opens contacts so it doesn't step up,it still does.
Hmmm
I thought this might be a clue, but looking at the schematic, this is correct behavior - only the special-based add replay is cut off when the replay unit is at 15.
That is odd, both the points replays and the matches DO NOT go through the 15th Pos Replay Unit switch. So you continue to get the knocks above 15 credits for everything but specials.
EDIT: Looking thru some other schematics, this is common... NVM