Having replaced the vend solenoid for the slot, I then swapped the B&C row harnesses to see if the problem went with the C harness, and alas the problem remained in C4, so the problem has to be at the board. Even speaking with Dixie they agree in that after a self-test it continues to show the error. What do you mean by "X,Y" ? This is a glass front machine..... 5 rows, 9 vend slots per row.
I place all of my arcade games in laundromats, and they all hit a home run. Mostly use older games that mom & dad like... Ms. Pac, Galaga, Centipede, etc... and driving games do well also.