Step 16
Grasp the upper case on either side of the keyboard space and rotate up and away from the screen.
You may be thinking you're about to break your upper case. Not to worry - the tabs holding the upper and lower cases together are very strong. Simply apply even pressure and continue to rotate the upper case up and away from the screen until it comes free.
Step 17 — Optical Drive
If the optical drive is not open, use a straightened paperclip to open it now.
Remove the 5 mm standoff.
Step 18
Disconnect the optical drive cable from the logic board.