As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF HAD SEVERE LOUD WIND NOISE INCREASING WITH AIRSPEED COMING FROM CAPT S SIDE WINDOW. WINDOW APPEARED TO BE CLOSED AND LOCKED. RETURNED TO LRD TO INVESTIGATE. NO EMERGENCY DECLARED. WHEN AIRCRAFT ARRIVED AT GATE NOTED CAPT SLIDING WINDOW HAD SEAL WEDGE OUTSIDE OF WINDOW FRAME. NO DAMAGE TO SEAL NOTED, REALIGNED WINDOW SEAL IN GROOVE AND PERFORMED OPERATIONAL OPEN/CLOSE CHECK ON WINDOW. OPS CHECKED GOOD & SEAL REMAINS SEATED. REF AMM 56-12-13-06. OKAY TO CONTINUE.