What was found
LOUD SQUEAL FROM FO WINDOW ABOVE 6.2 PSI DEBRIEFED FLIGHT CREW. FLIGHT CREW STATES NOISE WAS FROM LEADING EDGE OF FO SLIDING WINDOW, NOISE STARTED AT A DIFFERENTIAL PRESSURE 6.2PSI AND CONTINUED WITH NO OBVIOUS STOPPING POINT DURING DEPRESSURIZATION. FLIGHT CREW WAS UNABLE TO PINPOINT OF WEAR MARKS AND WINDOW GAPS AROUND RH #2 WINDOW. NOISE, STATED AIRSPEED MADE NO DIFFERENCE ONLY DIFFERENTIAL PRESSURE. ON GVI OF WINDOW FROM INSIDE FOUND LOWER LEADING EDGE OF WINDOW FRAME TO HAVE SCUFF MARKS. REMOVED AND INSTALLED NUMBER 2 OPENABLE WINDOW UP TO AND INCLUDING STEP E(6). REF AMM TASK 56-12-11/401, INSTALLED RIGHT HAND OPENABLE WINDOW IAW WITH AMM 56-12-11-400-801 UP TO PAGE 6 PARA (12). PERFORMED LEAK CHECK OF THE #2 OPENABLE WINDOW REF: AMM 05-51-91. FOUND THE RIGHT DRAIN TUBE PINCHED BETWEEN THE FRAME AND WINDOW CAUSING A LEAK. REPOSITIONED AND SECURED THE RIGHT DRAIN TUBE AND PERFORMED ANOTHER LEAK CHECK. LEAK CHECK PASSED. NO LEAKS NOTED. COMPLETED INSTALLATION OF THE #2 OPENABLE WINDOW REF: AMM 56-12-11. NO DEFECTS NOTED AT THIS TIME.