Reply to Left SYNC button doesn't light up blue

Hey,
since I got my unit a few months ago the left SYNC button doesn't switch between green and blue, only green and <off>... I guess the LED was dead on arrival, I upgraded the firmware and hoped that could fix it but apparently not

Any way of fixing this? Since the LED was dead since the start it should be covered by the warranty, but it's just a LED and I did modify it so the warranty might be void.

Plus I hate the screws on the unit, I almost ripped them to shreds trying to open it :P