Hi all, I'm just about to change my battery & guessing i will need to have my radio code ready for it to work after the swap? If i am, where would i find this & what does it look like? I know it should be in the "Manual Pack" but i just want to know if I'm missing anything obvious? i heard that sometimes the code is on the back of the unit? is this true? The Radio in Question is Audi Navigation System plus (RNS-E) from factory for a 2008 Audi S3 - not sure if it makes any difference lol. Thanks in advance & hope you guys can help!