I replaced the top one in the LCD (same bulbs as the others). Oddly, to the human eye, it's much brighter, but the camera just doesn't pick it up. I didn't replace the bottom bulb, since you have to take the IP partially apart, I think, to get to it. Next time I'm in there, I'll probably replace the bottom backlight bulb in the LCD.
It is quite easy, you will have to remove speedometer and then LCD screen. If I am not mistaken it was a smaller size bulb.