Hello, I am a newbie to this site and any help would be appreciated. I replaced the battery on my 2001 E320 this past week and of course the radio will not work until I put in the security code. Unfortunately The head unit was replaced before I owned the car while it was under warranty and the radio's serial number was never updated in the repair records. I am being told by Mercedes that the only way to get the new code is to bring it into the shop and they will remove the radio and get me the new code. (All for a fee of course.) Honestly I cant afford to take a half a day off from work to get my radio fixed. I looked to see if I could get the serial number of the radio myself but although mechanically inclined I cant figure out how to get the radio out to accomplish this task. Can anyone give me any suggestions?