The 3.5 mm Phillips screw indicated below with a red circle may be absent in some models.

Remove the following 5 screws and 3 nuts from the heat sink:

One 3.5 mm Phillips from the lower left corner of the heat sink.

Three 6 mm Phillips from around the fan.

One 7.5 mm Phillips at the top right corner of the heat sink.

One 4 mm nut from the side of the heat sink.

Two 4 mm screw nuts with attached springs from either side of the heat sink.