Remove the following five screws securing the Wi-Fi antenna to the logic board:

One 2.3 mm Phillips

Two 1.6 mm Phillips

One 1.4 mm Phillips

One 4.8 mm Phillips

When re-assembling, start off with replacing the 4.8 mm Philips screw first, then the 2.3 mm. This is to ensure there is no mix-up, and avoid rendering the LCD and digitizer useless.

Also make sure to put the long 4.8 mm Philips back in correctly when reassembling. This is the ground for the Wi-Fi antenna and is often the culprit if you are having bad Wi-Fi reception after reassembly.