Remove both expansion bay modules using the levers on the front of the computer.
Insert your index fingers inside the expansion bays and search for the two ribbed tabs on the underside of the upper case. The tabs are located near the bottom corners of the keyboard.
Pull the tabs toward yourself and the keyboard will pop up.
Slide a spudger downward between each plastic strain relief cable and the wall of the case in order to bow out the cable beyond the small tab holding it in place.
Once the strain relief cables are free, lift the keyboard off.