Mine recently started illuminating after my passenger floorboard was flooded with rain water from a plugged up cowl drain vent hole. That is now cleaned out but the drying out process has just begun. I am hoping it's simply coincidental that a bulb is going out at this time and not a problem from something getting wet other than a light that is causing current draw or resistance on the lighting system. There is no visible bulb out, yet the light indicates something wrong, time to start testing.
My flooding was bad enough that the fan sounded like a prop in the water when I turned it on.