recently i noticed the Turn Signal Indicator Lamps in my 06 starting to fade, well now they've faded to nothing. The signal lights themselves operate correctly, but its a bit of an annoyance not having the Turn Signal Indicator Lamps working at night.

I've since pulled the cluster and swapped in some led's and noticed no bulbs line up with them so figured its some sort of electrical issue, but no idea where to start, any ideas?