This is a step-by-step guide to remove the outer case on the AirPort Extreme Model A1034.
Remove the three 14.3mm T7 Torx screws from the bottom of AirPort.
Remove the 5.1mm Phillips screw from the bottom of the AirPort. This screw is located under the identification sticker. You will have to remove the sticker or make a hole to remove it.
Lift the bottom and top casing straight apart and then lift metal casing straight up from the bottom plastic casing.
Unplug the black connector on the top of the metal casing by gently pulling horizontally.