I now have a Stormtrooper N9 that can hold the SIM tray but has dismal WiFi. WTF?

Are all antennas apart from the GPS concentrated on the lower assembly below the speaker, or is there a separate Wi-fi/Bluetooth antenna somewhere? On the N9 service manual, I see both a "Main Antenna flex" and a "Wi-fi/Bluetooth flex" but the manual does not show pictures of either.

------ Solved it! -----

I disassembled it again to move to another, inferior, blue housing that I had bought at the same time (but was noticeably a pull from a disassembled phone). Looking at it I realized that one contact point, noted on the picture attached, had a difference: I had not flattened it against the chassis before dropping the mainboard in. (it has a small sticky tape attached to it, after you press it against the chassis is stays there). I confirmed that my original black housing was the same and took a picture for you.

I reassembled the phone on the white housing and now the Wi-Fi and everything else I have tested works - I've tested all I can remember apart from GPS navigation and the microphone during a call.