Remove the two Phillips PM2.5×4.0 screws (2) and the ten Phillips PM2.5×8.0 screws (3) that secure
the top cover to the computer.
Remove the four Phillips PM2.5×5.0 screws (1) and the two Phillips PM2.5×11.0 screws (2) that
secure the top cover to the computer.
Turn the computer right-side up, with the front toward you.
Open the computer as far as possible.
Chapter 4 Removal and replacement procedures