Chevrolet 2008 Corvette Owner's Manual page 138

1. Open the tonneau cover by pulling the emergency
release cable.
The tonneau cover emergency release cable is
located behind the passenger's seat head restraint,
on the underside forward edge of the tonneau
cover. Also, see Hatch on page 2-14 for information
on the emergency trunk release handle.
2-74
Be careful when opening the tonneau cover by hand.
If the tonneau cover is opened quickly, damage can
occur to the hinging mechanism, which can prevent
proper operation of the convertible top.
2. Locate the pressure release bolt on the front side of
the hydraulic pump.