WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: View Of Reverse Band Assembly
Courtesy of GENERAL MOTORS CORP.
Tilt the band in order to disengage the band from the anchor pin in the case. Remove the reverse band assembly (615).