Teardown required: As I have no audio input from the Mic.

Does anyone know of a complete tear-down of this headset.

My son drop his headset when he was younger but since then there is no audio from the mic but the headset does work wireless. (Just no audio i/p).

Thinking of taking some time out to finally getting around to tear it down to see whats going on, but wanted to see if anyone has done it first so I can follow as a guide.