they dont all have SMD chip type leds as pete said so theirs a chance yours could be a standard bulb that has blown, theirs a few diff types of clocks that vairy..most the later ones do have SMD chips but theirs some with normal as i just said..
all the early type have normal bulbs and no smds, some of the later use a mixture of both but my anniversary dials are all SMD except for the indicator arrow signals
clocks easy to remove, 10 min job at the max