Remove the following six screws securing the logic board to to the upper case:

One 2.6 mm T5 Torx screw

Two 5.8 mm T5 Torx screws

One 3.8 mm T5 Torx screw

One 5.2 mm Raised Head T5 Torx screw

One 3.5 mm Silver T5 Torx screw