I have a '97 Pontiac transport and the rear lifgate will not unlatch. It has the electric locks and you can hear the unlock click, but itwill not open. The hand latch does move, but it does nothing. Trying to manually unlock with the key is to no avail, as the key will not turn at all. There does not appear to be any way to get to the latch short of starting to cut apart the interior. Has anyone every heard of such a problem? Any suggestions as how to get this open?