Remove the following screws securing the logic board to the rear case:

Two 2.3 mm Phillips screws

Two 2.7 mm standoff screws.

These screws have a Phillips bit pattern, but we found the best removal tool to be a 2.5 mm flathead driver.

One non-magnetic 2.7 mm standoff screw

Be sure to put this screw back in its original position at the top of the logic board. A magnetized screw may interfere with the digital compass.

Reassembly hint: when putting the standoffs back in, use the tip of a spudger like a screwdriver to get them started.