Step 4
Lift up on the L-shaped memory cover, slide it to the right, and lift it out of the computer.
Step 5 — Upper Case
Remove the following 3 screws:
One 11 mm Phillips in the middle of the case.
Two 14.5 mm Phillips.
If the screws stick in the case, you can use a magnetized screwdriver to draw them out.
The shorter of the three screws goes in the middle.
Step 6
Remove the following 3 screws from the rear wall of the battery compartment:
Two 3 mm Phillips.
One 4 mm Phillips on the right side.