Step 28
In order to deroute the speaker cable from the front edge of the logic board, you must disconnect the PRAM battery cable.
Deroute the speaker cable from the front edge of the logic board.
Step 29
Disconnect the 9 indicated cables from the logic board, starting in one place and moving around the board.
There should be no cables connected to the top of the logic board at this point.
Step 30
Remove the following 12 T8 Torx screws from the logic board:
Four 3.9 mm, three along the front edge of the logic board, and one just above the right fan connector.
Three 6.9 mm large-headed screws in the upper, left corner of the logic board.
Five 6.9 mm scattered on the right half of the logic board.