Range Rover Evoque Satnav not working, audio and phone pairing fault, how to diagnose and fix.

How to check the audio system on your RangeRover Evoque, starting with the MOST bus also called the optical bus.
This vehicle came into me with the video/media greyed out, unable to pair a mobile phone and the satnav displayed a message saying initialising.
First step not in the video was to run a diagnostic scan looking for any fault codes that could relate to the symptoms we are seeing, and to check communication to all the modules.
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