Some additional/alternative information on this problem as it has another cause: As was explained above the 'MOST' Ring daisy chains around the various modules (and a break in this ring will render the system inoperative).... but if the power to a module fails it can show up as a 'MOST' issue via DiCE.
In my similar case the power wiring to the under-seat SatNav DVD player had been damaged by catching on the seat mechanism and breaking....
(There are two wires - brown and purple- to the green plug on the back of the player, and, like the MOST fibre ring they really need tie-wrapping down... )
For some reason (probably its position in the chain) the DiCE indicated that the PHone Module (PHM) has problems
Symptoms were again that the Radio/Phone/CD/RTI did not work.
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