Locate and remove the twelve (12) Phillips #2 screws around the outside of the metal chassis located underneath the optical drive.

Three (3) of the twelve (12) screws are located underneath the cooling fan housing

Five (5) of the twelve (12) screws are located to the right of the optical drive unit. Refer to picture 2.

Four (4) of the twelve (12) screws are located to the rear of the unit, shown in picture 3.