What was found
SDF - FLIGHT 2431, THE CREW REPORTED A BURNING SMELL IN THE CABIN DURING PREFLIGHT INSPECTION. MAINTENANCE INSPECTED THE AIRCRAFT AND REMOVED OVERHEAD LIGHT AT ROW 4A, PLACED CABIN LIGHTING ON MEL, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE. MX REPLACED THE LIGHT BULB ABOVE ROW 4A, OPERATIONALLY TESTED WITH NO DEFECTS OR SMELL. REMOVED THE MEL, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.