I bought my 2006 LR3 HSE used and initially the bluetooth phone system worked great pairing with my iphone 5, however a few months later out of the blue folks on the other end were unable to hear me. The microphone went dead.

I went in through the navigation system and determined that the microphone wasn't working - through the test screen.

i've seen people mention on various forums that the microphone often goes dead because of wires chafing. To fix it its been suggested to remove the head unit and replacing the wiring but i've been unable to locate any instructions.

Anyone have a how-to or some pictures?