Access the 7x7 panel (with all the small square green buttons on the lower lefthand side). Press a button, note the color of the buttons. Look at the paper on the wall for something that matches that color.
Alright. You'll want to flip the switch to the left. The number pad that comes up is connected to the "Monsier Braille" portion of the paper. The braille translates to two different number patterns. Each 4-digit pattern brings up a different panel.
