2007 STR 45k milesMy audio system has stopped working:CDC not recognised, tel module not recognised, voice commands failure (screen says "mute on"), no audio on sat nav.....no audio full stop.I have checked the optical connections in boot/trunk and all seem fine and fuses are good. Someone told me that there can be a dodgy connection in the passenger footwell but I can't find it...Can anyone shed some light on where it is?CheersRob