Remove the single T8 Torx screw from the front left corner of the PMU.
Lift up the front edge of the PMU and disconnect the three smaller orange ribbon cables (two on the left side of the large PMU cable, and one on the right side) that attach to the underside of the PMU from the upper case.
Turn the upper case over and pull the PMU connector cable up from the upper case.
Turn the upper case back over and slide the PMU out.
You have successfully removed the PMU. To reassemble your laptop, simply follow the directions in reverse order.