I own this machine so I might be able to help.

Now I don't fully understand the schematics here but I can see a couple switches that might be worth looking at. Considering specials and number matching both work, we can rule out the add replay relay.

First checks and ohm out all the contacts on the L relay (1000 point relay). The contact used in this circuit is also used for the chime so if the 1000 chime is working, it shouldn't be it.

While doubtful cause the other replays work, try ohming out the switches on the W relay. It also plays a role in getting power to both the knocker and add replay unit.

I'd also try cleaning the plugs that set the replay value. Using 600 grit sandpaper or just a thick bristle brush clean the plugs. If you have any pipe cleaners, you can use those to clean the female plugs. I just put a bit of 99 isopropyl alcohol on them and give em a quick scrub.

Next you're gonna wanna check the make/break switches of P1A and P1B. These are switches on the stacks located behind the ball count unit. If you're not familiar, watch havepin's useful video on identifying them.

If that doesn't work, I'd have a look at the actual drums of the thousands and 10 thousands score reel. There's a circuit board on them, and it's possible the contact in the reel that tells that machine what number it's at is dirty. That would also cause set score replays to not work.

Those are my best guesses, hope any of that helps. Have you tired the number match with both players? If it's only happening to one player that helps narrow down the problem.