What was found
LOUD SQUEEL CAP COCKPIT WINDOW PASSING 30K 290KNOTS PER FLIGHT CREW REPORT AIRCRAFT STARTED TO MAKE LOUD SQUEEL AT 30K ALT AND STOPPED WHEN DESCENDED TO 19K ALT. NO ISSUE WAS NOTICED WITH PRESSURIZATION. PERFORMED DETAIL VISUAL INSPECTION AND FOUND SMALL CRACK ON CA WINDOW SEAL. REF AMM 56-11-53-404-004 REPLACED CAPTS SLIDING WINDOW SEAL. SEALANT APPLIED. ACCOMPLISHED PRESSURIZATION CHECK TO 4PSI IAW AMM 05-51-24-702-001. NO SQUEALS OR ABNORMAL NOISE NOTED.