I recently bought an AP2 head unit (from a 2007 apparently) to go in my AP1. The backlight for the radio's display does not work. The buttons do light up however. How difficult is it to access what I need to replace or resolder? I don't have a lot of electronics repair experience, but if it is a just a bulb replacement that requires a simple solder, I might tackle it myself. Does anyone have any experience with disassembling a stock head unit?

This is a picture of the style I have: