Use your fingers to push both battery release tabs away from the battery, and lift the battery out of the computer.

Remove the three identical Phillips screws from the memory door.

Lift the memory door up enough to get a grip on it, and slide it toward you, pulling it away from the casing.

Remove the two 2.8 mm Phillips screws in the battery compartment near the latch.

Remove the following 6 screws:

• Two 10 mm T6 Torx screws on either side of the RAM slot.
• Four 14.5 mm Phillips screws along the hinge.

Remove the four 3.2 mm Phillips screws on the port side of the computer.

Rotate the computer 90 degrees and remove the two 3.2 mm Phillips screws from the rear of the computer.

Rotate the computer 90 degrees again and remove the four 3.2 mm Phillips screws from the side of the computer.

Do not yank the upper case off quickly. The case is attached to the logic board via a ribbon cable.

Lift up at the rear of the case and work your fingers along the sides, freeing the case as you go. Once you have freed the sides, you may need to rock the case up and down to free the front of the upper case (there are some hidden plastic clips that need to be clicked off).

Disconnect the trackpad and keyboard ribbon cable from the logic board, removing tape as necessary.

Remove the upper case.

Disconnect the left ambient light sensor cable from the logic board by placing a spudger beneath the cable and lifting up.

Peel up the left ambient light sensor cable from above the left fan, removing tape as necessary.

Remove the single silver Phillips screw securing the clear plastic shield over the left ambient light sensor.

Lift the clear plastic shield off the left ambient light sensor.