iFixit

Remove the single 2.9 mm T5 Torx screw securing the AirPort/Bluetooth card to the logic board.

Slightly lift the free end of the AirPort/Bluetooth board and pull it out of its socket on the logic board.

To avoid damaging its socket on the logic board, do not excessively lift the free end of the AirPort/Bluetooth card.

Remove the AirPort/Bluetooth board from the logic board.

Remove the four 2.5 mm T5 Torx screws securing the heat sink to the logic board.

If the heat sink seems to be stuck to the logic board after removing all four screws, use a spudger to carefully separate the heat sink from the faces of the CPU and GPU.

Remove the heat sink from the logic board.

Logic board remains.

When reinstalling the heat sink, be sure to apply a new layer of thermal paste. If you have never applied thermal paste before, we have a guide that makes it easy.