It's at this point that most DS Teardowns and Part Replacements end.

Further Teardown focuses more on the previously mentioned ribbon and wi-fi cables connections to the upper screen, and with this the presence of the microphone ports.

To reassemble your device, follow these instructions in reverse order. Be sure to be very careful with the screw and cable placement of separate components of your DS, misplaced parts can either break or damage your system

Further information and process steps can be found here.