Remove the 2 silver 3.5mm phillips screws from the shielding on the right of the board. You can then remove and set aside the shielding.

Remove the 3 remaining silver 3.5mm phillips screws from the system board.

Remove the 2 black 16mm phillips screws from the right of the board.

Remove the 1 silver 14mm phillips screw from the center of the board.

Using a spudger, disconnect the audio cable from the board.

Carefully remove the audio port cover by gently twisting upward and lifting out.

The main system board is connected to the daugter board below. Using a spudger where indicated to gently coax the board free from the connector below.

You can now lift the main board out of the case.