on my 06 f150 screw, i just noticed tonight that the lights for the cruise control on and off in the steering wheel are suddenly not as bright as the rest. they seem to operate with the dimmer switch, and will fade but will only get about 1/2 as bright as the rest. does anyone know if they had light bulbs inside there, or if they are LED's like the other dash lights? also, are they replaceable?

Thanks !!!