I'm pleased to report that the unit is now re-installed,fully tested and working again
.The only issue I had initially was that the steering wheel controls were not working.So back to Mario and he informed me that the whole Motherboard had been replaced and therefore the steering wheel controls would probably require Re-programming.The unit was asking me for a code for the SRC which Mario due supplied along with clear instructions for the programming procedure.I followed these carefully and Hey Presto working SRC's.The only other thing I to do was reset the iGO navigation path,(once).Sometimes a little persistance pays off.