19. Turn on the Pivot Platen switch and listen to the vacuum port on the bottom row to verify vacuum is present and not bleeding though to the 2nd, 3rd and 4th rows. Turn on the switch for the 2nd row and verify vacuum is present and not bleeding through to the 3rd and 4th rows. Turn on the switch for the 3rd row and do another check making sure vacuum is present and not bleeding through to the 4th row. Finally turn on the 4th row switch and make sure vacuum is present in the final row. Turn off all switches for the Pivot Platen.