Step 10
Disconnect the trackpad and keyboard ribbon cable from the logic board, removing tape as necessary.
Remove the upper case.
Step 11 — Optical Drive
Disconnect the orange SuperDrive ribbon cable from the logic board, removing tape as necessary.
Step 12
Remove the following 4 screws:
Two 3.3 mm silver Phillips screws on either side of the SuperDrive.
One 4.7 mm silver T6 Torx screw from the top left corner of the drive
One 6.2 mm black Phillips screw at the top right corner of the drive.