hello, my battery died on my 2008 micra yesterday and now i can’t find the radio code so i guess i have to remove the radio unit to find its serial number but i don’t see how to do that. can anyone help me? its a clarion radio unit with single cd player and bluetooth. there are two screws on the fascia below this unit but before removing them and plunging in i’d like some advice re how to do it. regards, johnbee