What was found
1 40 INTO FLIGHT AT FL370, WINDOW SEAL ON CAPT SIDE DEVELOPED LOUD SQUEAL. TOO LOUD TO CONTINUE FLIGHT. NOISE DISSIPATED UPON DESCENT THRU 15,000'. REMOVED AND REPLACED LEFT SLIDING CLEAR WINDOW PER MD-10-10 AMM 56-12-00-4. PRESSURIZED A/C PER MD10-10 AMM 21-31-00-5, NO LEAKS NOTED, WINDOW OK FOR SERVCICE.