Step 16 — ExpressCard Cage
Disconnect the hard drive and ExpressCard connectors from the left side of the logic board.
Step 17
Disconnect the three antenna cables attached to the Airport Extreme card.
Apple was kind enough to include a label showing where each color antenna cable plugs in - just make sure to look at this when reconnecting the antenna cables.
Step 18
Remove the single black T6 Torx screw located just above the Airport Extreme card.