Thanks to Lexusk8 for the original post. I just replaced mine; 2 bulbs, each $6.66(!) from Lexus. All this time I thought it was the individual switches that had inoperative lights. Had I known, I would have done these when I replaced my Pioneer LCD screen last weekend. Happily, my radio has no inoperative lights.
Interestingly, the new LED bulbs could not be hand tightened into the circuit board. I needed a thin blade screwdriver to gently turn them in their track. For future's sake, I sprayed a small bit of DeOxit onto a Q-tip, and rubbed that around the track for all the LED bulbs, before affixing the bulbs into their tracks.
Nice to have all lights again, after a couple years!