As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER 20 MINUTES FLYING, AIRCRAFT RETURNED TO GROUND AND FLIGHT CREW REPORTED LEFT SLIDING WINDOW NOT SEALING ON ENTIRE AFT EDGE WITH HEAVY AIR NOISE. THE AIRCRAFT WAS GROUNDED. CHECKED LEFT SIDE SLIDING WINDOW FOR CONDITION AND OPERATION AND NO PROBLEMS NOTED IAW AMM 56-11-02. CHECKED WINDOW SEAL AND FOUND NORMAL. NO DEBRIS NOTED. ACCOMPLISHED AIRCRAFT PRESSURIZATION AIR LEAK CHECKS IAW AMM 05-51-24. NO LEAKS NOTED.