This is a small pita, not any major issue , but perhaps someone has the answer. The (center)knob on the combination switch no longer lights up at night as it used to, as is obvious from the "black hole" in the center of the otherwise orange display. I pulled the knob out and replaced the tiny bulb -but no change. The bulb itself checked out OK. The switch seems to work fine otherwise. This too is a good excuse to check out the digital camera....

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