Step 37
Lift the display off.
Step 38 — DC & Sound Card
Remove the following 7 Phillips screws from the heat sink:
Four 4 mm silver screws.
Two 5 mm black screws.
One 9 mm silver screw in the upper left corner of the left fan.
Step 39
Remove the heat sink from the case, minding the left corner, as it tends to catch in the case (the fans will come out with the heat sink).