Crane National GPL PCB Tray Board for Crane National & GPL models including 157, 158, 159, 160, 167, 171, 172, 173, 427, 452, 485, 780, 789 snack vending machines. If your machine has one selection not working and the tray harness looks good, then more than likely its a faulty tray board. To get a second opinion swop a working tray with non-working tray in the machine. This is a brand new tray board from factory.