Step 16
Peel up the silver foil tape between the fan and the optical drive.
Step 17
Use a spudger to move the gray display data and black speaker cables to the right. This will reveal a silver screw securing the fan housing to the lower case.
Step 18
Remove the following 2 screws:
One 3 mm Phillips on the right side of the fan.
One 6 mm Phillips on the left side of the fan.