As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHORTLY AFTER TAKEOFF, THE FLIGHT CREW REPORTED A NOISE COMING FROM JUST AFT OF THE CAPTAIN'S DV WINDOW. THEY COULD SEE SOMETHING SLAPPING THE FUSELAGE BUT COULD NOT IDENTIFY WHAT IT WAS SO THE AIRCRAFT RETURNED TO FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND A SECTION OF THE CAPTAIN'S DV WINDOW FILLET SEAL WAS LOOSE. THE LOOSE SECTION OF SEAL WAS REMOVED AND FINAL REPAIR PLACED ON 100 FLIGHT HOUR DMI FOR FINAL REPAIR.