In the middle of playing a game the bottom right upkicker stopped working. Had to turn the game off and take the balls out manually. I went in to the solenoid test and solenoids 4, 5 and 6 are not firing but ALL of the rest are working appropriately. Fuses for those three check out. Wiring for all looks good. Any ideas to the problem. I was trying to decipher the schematic, but I have not been able to figure out where they are controlled on the board.