WARNING: This page is about a different car, the 2009 Pontiac Torrent and 2009 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Control Valve Body Cover
Courtesy of GENERAL MOTORS CORP.
Remove the 9 control valve body cover Torx bolts (28).
Remove the control valve body cover (29). Do not bend the cover flange.