Remove the blue wire by gently pulling.

Don't pull on either the wire itself or the connector attached to the board.

Disconnect the brown cable. This is done by gently pulling the black tab away from the white plastic. This will loosen the tension on the brown cable, allowing it to slide away from the tab gently.

Remove the four Phillips #1 screws connecting the circuit board to the optical drive assembly.

The fourth screw is located behind the screwdriver in the third picture.