Apple MacBook Pro 17-inch (original, Core 2 Duo, 2.4GHz, Late 2007 CTO, Early 2008, and Late 2008) - Manual (Page 42)

MacBook Pro 17-inch (original, Core 2 Duo, 2.4/2.6GHz, 2008) Take Apart — Keyboard 42
Use needlenose pliers to gently and carefully straighten the bend-tabs located along the 14.
bottom edge, as shown. These tabs lock down and stiffen the top edge of the keyboard.
Important: The bend-tabs are delicate. Bend with care to avoid damage. Avoid over-bending.
(a) MacBook Pro (17-inch) and MacBook Pro (17-inch Core 2 Duo) have four bend-tabs.
(b) MacBook Pro (17-inch 2.4GHz) and (17-inch Early 2008) have six bend-tabs.