You need to turn on the power by collecting keys and power cells from around the map, then the office unlocks.
The keys are: ontop of bar (climb pipes to get)
In the bar, near drinks
Box pile outside left door to office.
Then you use the keys to unlock all yellow circles(locks), grab the power cells in the locked rooms, and go to the locked room to the right of stage, open the power box, insert the cells and flip the switch.
P.S Marionette room code is 5304