Step 46
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).
Step 47 — DC & Sound Card
Disconnect the 4-pin power cable and orange ribbon from the DC/Sound card.
Step 48
Remove the T8 Torx screw from the RJ-11 board.
Remove the 5 mm standoff that secures the DC/Sound card to the lower case using a nut driver or pliers.