Step 10
Disconnect the trackpad and keyboard ribbon cable from the logic board, removing tape as necessary.
Remove the upper case.
Step 11 — Left Fan
Disconnect the iSight, inverter, and left fan cables from the logic board.
Step 12
Use a spudger to flip up the brown plastic flap securing the left ambient light sensor cable to the logic board.
Slide the left ambient light sensor cable to the left and out of its connector.