Subaru Repair: 95 Legacy Passenger Door Problem, electronic problem, legacy

Question
The passenger door on our Legacy won't open. When I use the automatic lock control to lock or unlock the doors, the passenger door stays locked ( and won't open) while all the other doors work fine. Where do I start to trouble shoot the problem? Could there be an electronic problem?

Answer
Will the door open if you manually move the lock on the door? Can you do anything to open the door? Can you unlock the door with a key? And, do you have the setup where when you lock the drivers door they all lock, and unlock the drivers door and they all unlock?

Try to answer those questions and we will go from there.   Z