As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: MAINTENANCE REPORTS CAPT SLIDING WINDOW HAS A VERY LOUD AIR LEAK . EXTREMELY LOUD ON T/O, INITIAL CLIMB. LESSENED AS DELTA P INCREASED. MAINTENANCE ACCOMPLISHED COCKPIT LEAK CHECK, FOUND LEFT WINDSHIELD TO BE LEAKING RATHER THAN SIDE WINDOW. REMOVED & REPLACED LEFT WINDSHIELD IAW CARD 26L21056001.