I recently got a 1981 308 GTSi. I was told that the driver side would lock but not unlock you would have to unlock the passenger door and then unlock manually. Now the passenger's side does not work either. I can hear clicking and both doors lock, but do not unlock. I rarely leave it unattended, and never leave it unlocked. Any idea's? I have a set manuals but they don't deal with body work. The parts manual has an exploded view of the door, it looks like the key should unlock the door directly.