In order to open the doors inside the instance you mus pull both levers simultaneously. You can tell which 2 levers to pull by the
glowing limfran that passes back and forth between them. Pulling unnecessary levers will result in the spawning of 3 ghosts each time they are pulled.
Sometimes the map shows it in control of the "Free People" and sometimes it's in the control of the enemy. It is not known right now what causes the switch.