What was found
L3 LOWER WINDOW SEAL HAS HIGH PITCH SQUEAL. ALT/SPEED DID NOT HE LP PILOT REPORTS NOISE STARTED AT FL380 AND CONITUNED THROUGH DECENT TO FL 130 . PICS ADDED WEAR PILOT REPORTS THE NOISE COMING FROM SUSPECTED NOISE IS COMING FROM UNCURED AERODYNAMIC SEALANT THAT STARTED TO PEAL OFF. SEE PICS. STARTED REMOVAL OF SEALANT. REMOVED FLIGHT COMPARTMENT L3 WINDOW REF AMM 56-11-10-024-001. REFER LP 4915350 INSTALLED #3L FLIGHT DECK WINDOW, UP TO INITIAL TORQUE COMPLETE. AMM 56-11-10-424-015.