What was found
DURING DESCENT, ABOUT 30 MILES OUT, 2 VISIBLE PUFFS OF SMOKE WITH ASSOCIATED ELECTRICAL ODOR UNDER F/OS GLARESHIELD. HAPPENED 2 TIMES WITHIN A 3 MINUTE PERIOD. AIRCRAFT OPERATED 15 ADDITIONAL MINUTES UNTIL LANDING WITHOUT FURTHER OCCURRENCE. ALL SYSTEMS OPERATED NORMALLY, NO C/BS TRIPPED. MAINTENANCE REMOVED F/O INSTRUMENT PANEL AND INSPECTED ALL WIRING AND ALL COMPONENTS FOR LOOSE OR DAMAGED ITEMS. NO SMOKE OR FUMES NOTED. INSPECTED FLUORESCENT LIGHT AND SURROUNDING AREA AND FOUND IT LOOSE AND SMOKE ODOR IN THAT AREA. THE LIGHT WAS DEFERRED AND ITS C/B PULLED AND COLLARED.