rear hatch operation 1990

[aafc]

I have been working part time at South Georgia Corvette an came across a
trouble with a early 1990 where the rear hatch won't open unless you set the parking brake ( car not running or running). open door and hit the switch (door or switch in consol) hatch won't open set parking brake and hatch opens.
My 1990 ZR-1 # 2546, hatch will open without setting parking brake.
So if have trouble opening your rear hatch, set parking brake. This only happened on this early 1990 ZR-1.
John
white/black # 2546
one of a few 4l8OE eq ZR-1's