Auto electrics - Help!

[Black TE50]

I have a couple of elctrical issues that are driving me nuts and which, so far, nobody has been able to fix.

1. Premium Stereo

At 'ignition on', no problems. But after a few seconds the volume drops and 'AU' appears on the screen. The volume control doesn't work, all the other controls work, but 'AU' is the only text on the screen regardless of the function selected.

Just to make things even more interesting, a mate from Robert Bosch tells me the head unit works fine "on the bench" and that the tecs couldn't replicate the problem there. Also, I borrowed a head unit out of an old cab and it works fine. The issue must be with the wiring of one of the added features in the Premium head unit.

I'm wondering whether something went amiss when my old Nokia car kit was taken out. Auto mute function? Any ideas?


2. Satnav

No signal to the screen.
I can't work out if its the screen, the CD player in the boot or the wiring (fuse is OK BTW).
Maybe this problem is linked to the Premium stereo?
Only clue I have here is that my T2 was converted from auto to manual and the wires which join the unit in the boot and the screen run right past the gear lever. Pinched wire?

Any assistance greatly appreciated.

Anyone know a good auto sparky in Mlebourne who knows their Fords?