WARNING: This page is about a different car, the 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: View Of Control Valve Body Assembly
Courtesy of GENERAL MOTORS CORP.
Remove the remaining twelve bolts (9, 12 and 16) from the control valve body assembly (18).
Remove the control valve body assembly (18).
Remove and discard the valve body to spacer plate gasket (22).