What was found
ORD - FLT 4280 - ON APPROACH FOR LANDING IN SBN, FLIGHT ATTENDANT NOTED SMOKE IN THE AREA OF THE READING LIGHTS AT SEATS 1DC. FLIGHT ATTENDANT SELECTED BOTH READING LIGHTS OFF AND SMOKE STOPPED IMMEDIATELY. MX INSPECTED AND NOTED THE READING LIGHT TRANSFORMER AT SEATS 11DC WAS BURNED. READING LIGHTS WERE DEFERRED FOR THE RETURN TRIP TO ORD, PER MEL 25-19. FOLLOWING ARRIVAL IN ORD, MX REPLACED THE READING LIGHT POWER MODULE UNIT. OPS CHECK GOOD. AIRCRAFT WAS RETURNED TO SERVICE. (M)