What was found
AIR TURNBACK-- F/O''S WINDOW LEAK. LOUD SQUEAL PASSING 1700 FT SOUNDED LIKE PRESSURE LEAK, SQUEAL STOPPED IN DESCENT AT 6 PSI. REMOVED AND REPLACED PRESSURE SEAL AT F/O NR 2 WINDOW, LEAK CK GOOD. CURRENT HISTORY: DEBRIS CLEANED FROM SEAL FOR SIMILAR WRITE-UPS, FLIGHT PRIOR AND 8/06/99 SEE LP 7571030 AND 7470337. RECOMMENDATION: REMAIN OPEN AND MONITOR.