Use your T5 Torx driver to remove the ten screws securing the logic board to the frame:

Six 3.8 mm screws surrounding the fans

Four 4.6 mm screws along the bottom edge

Use a 4 mm hex driver to remove the two 6 mm-long standoff screws securing the bottom corners of the logic board to the frame.

Use a T6 Torx driver to remove the two 6 mm screws securing the heatsink and logic board to the frame.