Play a four player game and set player 4 (only) to the correct number to Match. Does that player win the free game? if so, the player 1 ten's score reel needs to be disassembled cleaning the wiper onto the bakelite board. Player one gets really dirty and usually the Match feature fails there first. Of course, there are contacts on the 00-90 (player Match) Unit that can be the problem as well.

There may be a label on the assembly that says "Replay Unit".

The idea of the match unit wiring is to make it difficult for players to calculate what number will appear and then let the last ball drain to win a replay.

Heck, older Bally EM's were simple since a "random" extra ball score light would come on whenever the match unit was at 0. And they would step down 9 8 7 6 Etc. Thus, it was very easy to determine what the match number would be. To help you out it would be best for you to simply set the match unit at 0. And then physically hold the plunger or cut the wire on the solenoid of the match unit and then you can set the score real at zero and drain the ball.