What was found
SHIP 6814 AT FL380 SMELLED A SLIGHT BURNING SMELL COMMING ONLY FROM THE CAPTAIN SIDE LOWER VENT WHEN OPENED. FOLLOWED PROCEDURES TO REPORT IT AND QRH. CORRECTIVE ACTION: REMOVED CAPT HEATER IAW B757 AMM 21-45. FOUND DEBRIS LODGED IN HEAT. SWAPP SHOULDER HEATER AND INSPECT DUCTS TO SEE IF MORE DEBRIS IS FOUND. INSTALLED CAPT SHOULDER HEAT B757 AMM 21-45. OPS CHK GOOD,NO SMELL OR ODOR INSPECTED DUCTING NO MORE DEBRIS FOUND. (0959778)