A few years ago someone tried to break into my 2012 charger with what i assume was a knife or flat head screw driver. The physical key in the fob will not open it. I didn't sweat it. But, now that the car is 7 years old, i know that battery in the trunk can possibly go at any time. Has anyone here replace the cylinder? whats the part number? is it easy to do at home? the dealer want to charge over $600.