Remove the following ten screws securing the lower case to the upper case:

• Three 13.5 mm (14.1 mm) Phillips screws.
• Seven 3 mm Phillips screws.

Using both hands, lift the lower case near the vent to pop it off two clips securing it to the upper case.

Remove the lower case and set it aside.

Remove the two 7.4 mm Y1 Tri-Wing screws securing the battery to the upper case.

Note: For certain repairs (e.g. hard drive), removing the battery is not necessary but it prevents any accidental shorting of electronics on the motherboard. If you do not remove the battery, please be careful as parts of the motherboard might be electrified.

You do not necessarily have to follow steps 3-6 to remove the battery in order to replace the hard drive. However it is recommended to remove all power sources from electronics before working on them.

Use the tip of your finger to carefully peel back the corner of the warning label to reveal a hidden Tri-Wing screw.

Remove the last 7.4 mm Y1 Tri-Wing screw securing the battery to the upper case.

Lift the battery by its plastic pull tab and slide it away from the long edge of the upper case.

Do not try to completely remove the battery just yet.

Tilt the battery away from the logic board enough to access the battery cable connector.

Pull the battery cable connector away from its socket on the logic board and remove the battery from the upper case.

Pull the battery cable connector away from the center of the logic board.

Remove the three 3.4 mm (3.1 mm) T6 Torx screws securing the left fan to the logic board.

Use the flat end of a spudger to disconnect the left fan connector from the logic board.

It is useful to twist the spudger axially from beneath the fan cable wires to release the connector.

The fan socket and the fan connector can be seen in the second and third pictures. Be careful not to break the plastic fan socket off the logic board as you use your spudger to lift the fan connector straight up and out of its socket. The layout of the logic board shown in the second picture may look slightly different than your machine but the fan socket is the same.