I am having a similar problem. The key turns both ways and seems to go past the stop when going right. I can hear the mechanism move and the doors both lock and unlock but you cannot get the truck latch to release, therefore the trunk will not open. I do not see any way to remove the lock from the outside. I looked briefly at my other car and found only the adjustment for the latch(3 bolts).
Do I have to drill it out to get it to open? What options do I have? What procedure is followed to insure doing as little damage as possible?
Your help is greatly appreciated and, as always, thanks in advance.
92 500E 90K miles stock less AMG chip
73 Datsun 240Z, 74 260Z, and a 75 280Z 2+2