On my '06 3500 the right turn signal indicator light stopped working. The exterior lights all work good and the flasher noise still is operational. Everything works except the green arrow light in the instrument cluster. Is there a bulb to be replaced or am I in for an expensive replacement of the instument cluster. I read in the factory repair manual the illumination is from a LED soldered in the circuit board. Is this something that is repairable? Has anyone had this happen? The entire cluster was replaced back in Sept. 2010 when I bought the truck from the dealership because the tach wasn't working. Any suggestions.