Step 25
Turn the laptop over.
Disengage the small locking tab by pressing in on the upper case to the right of the PMU connector.
Lift the upper case up just enough so that the tab rests on its metal bracket.
Step 26
Grasp the upper case near the back left corner and lift up partly so that you can access and disconnect the audio in/out cable from the sound card in the upper right corner of the case.
Be careful not to lift the upper casing too far before you have disconnected the audio in/out cable.
Remove the upper casing. Note that there are two tabs on the laptop's front that often cause the upper case to stick.
Step 27
Your laptop should look approximately like this.