What was found
STRANGE LOUD RATTLING SOUND - APPEARS TO COME FROM INSIDE DUCT ABOVE CAPT FWD WINDSCREEN FOUND APPROX 8 INCHES PORTION OF AERODYNAMIC SEALANT ABOVE CAPT'S NR 1 WINDOW FLAPPING IN THE WINDSTREAM. CUT AWAY OLD SEALANT AND REMOVED REMAINING LOOSE SEALANT. RECONDITIONED AERODYNAMIC SEALANT AND TAPED WITH SPEED TAPE PER MT. TAPE TO REMAIN IN PLACE A MINIMUM OF 24 HOURS FROM 1300-15 PST. ALSO UPPER FUSELAGE ABOVE CAPT'S WINDOW HAD SEALANT RESIDUE FROM FLAPPING SEAL. BLACK MARK FROM SEALANT REMOVED TO DEGREE POSSIBLE. REMOVED TAPE, SEALANT IS INTACT.