Use the tip of a spudger to flip up the retaining flap on the left fan ribbon cable ZIF socket.

Be sure you are prying up on the hinged retaining flap, not the socket itself.

Starting at the top of the cable, slide a plastic opening tool under the left fan cable to free it from the logic board.

Use caution when freeing the cable, as it is strongly adhered to the logic board. If necessary, use an iOpener or hair dryer to heat the cable in order to soften the adhesive and make it easier to remove.

Lift the left fan out of the device.

When reinstalling the fan, it's easier to connect the fan ribbon cable as you drop the fan in place, rather than after you've installed the three fan screws.