What was found
(CAN) DURING FLIGHT, CREW REPORTED THE LT ADAPTER HEATER INOPERATIVE. DURING "AFTER FLIGHT INSPECTION", FOLLOWING FLIGHT CREW FEEDBACKS, A BURN MARK OF 30 MM X 20 MM WAS FOUND ON TOP OF HEATER, PN 215T60636-4. HEATER WAS REPLACED AND ACFT PUT BACK INTO SERVICE, NO OTHER OCCURENCES REPORTED.