What was found
SMOKE IN PILOT REST AREA COMING FROM VENT, ALSO IN FOWARD GALLEY PER CREW DEBRIEF, F/A STATED SMOKE COMING FROM PILOT BUNK AREW VENTS, DID NOT SMELL ELECTRICAL PER F/A & PILOT THAT INSPECTED AREA. UPON ARRIVAL TO ACFT NO SMELL, ODOR, OR SMOKE SEEN WHEN DOOR WAS OPENED. STATED IT DID SMELL ELECTRICAL. NO SMOKE ALARM SOUNDED IN FWD FLT CREW AREA. SMOKE ODOR FROM PILOT CREW REST AREA SMOKE DETECTORS OPS CHECKED GOOD IAW AMM DMC-B787-A-26-14-10-00A-300B-A. CHECK OF CARGO BAY IAW FIM TASK DMC-B787-A-21-20-F5-72A-421A-A. NO DEFECTS NOTED. COULD NOT DUPLICATE. FOUND EVIDENCE OF DUCT HEATER ELECT BURN. REMOVED & INSTALLED OVERHEAD FLIGHT CREW REST DUCT HEATER IAW AMM 787-21-41-20-00A. OPS CHECK GOOD.