The discdrive is found next to the motherboard and power board inside the device. This guide will take you through the steps of removing the discdrive for replacement.
Use a Phillips #1 screwdriver to remove the four 5mm screws that connect the black outer shell to the silver back of the device.
Use a Phillips #1 screwdriver to remove the two 5mm screws on the left and right side panels.
Lift the black cover to a 45 degree angle from the rear of the device and pull away from the device.
Use a Phillips #1 screwdriver to remove the two screws that secure the Optical Drive.
Detach the tape wires from the motherboard and power board.
Lift the disc drive up to a 45 degree angle and pull back out of the device shell