Nissan Micra K11 2002..Missing the CD/Radio Code for Nissan/ Clarion C060 Unit

[thomastt37]

Hi have just picked up this car for my wife and although the Service Book and Handbook were with the car the CD/Radio Code wasn't included, However it is working as it should at the moment but may not if the battery fails or is disconnected.Can anyone advise how the unit is removed from the dashboard so as to find the serial number of the radio.Secondly if I am able to do this how can I get the correct code? I have been told that only a Nissan Main Dealer can do this? Any advise appreciated  Michael