Step 22
Deroute the hard drive cable from along the front of the optical drive.
Step 23
Lift the front edge of the optical drive and slide it up and out of the computer.
Step 24 — C-Channel
Remove the following 3 screws:
Two 3 mm Phillips near the right speaker.
One 6 mm Phillips threaded through a hole in a plastic finger above the subwoofer.
Be careful not to over-tighten the screw above the subwoofer too tight or the plastic could crack.