My car: 2003 Sonata 67,000 miles v6 gl model

Recently, I noticed that my led lights that light up the fan speed around
the dial are out. The other **** which shows the blue going to red works
fine as well as the push button controls that are used to regulate the air
flow. Is this something easy to replace. I recently bought a garmin gps unit
and for the first time used the 12 volt outlet. Could this have fused the
led light out by chance. What steps should I do to find out why and how I
can correct the problem. It is very bothersome when your used to that ****
being lit at night and now its all dark!!

Thanks,

Jeff