What was found
F/O'S WINDOW MADE A HIGH-PITCHED SQUEALING NOISE ABOUT AN HOUR INTO FLIGHT. VERY LOUD NOISE APPEARS TO HAVE MOVED TO THE BOTTOM LT CORNER. VISUALLY CHECKED WINDOW SEALS AND PRESSURIZED ACFT AND LEAK CHECKED F/O'S NR 2 WINDOW, FOUND LEAKS AT FORWARD LOWER AND UPPER CORNERS. FOUND LOOSE RETAINING BOLTS, TORQUED THE WINDOW RETAINER BOLTS IN REF TO AMM 757 56-11-02-4. SUB TASK 56-11-02-414-047. PRESSURIZED ACFT SECOND TIME NO LEAKS NOTED AND NO SQUEAL. ACFT OK FOR SERVICE.