As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN FLIGHT ONLY, CONSTANT LOUD AIR FLOW NOISE COMING FROM THE GRATE AREA NEAR THE FLIGHT DECK DOOR ON THE FLOOR. PERFORMED INSPECTION OF FWD ACCESS DOORS SEALS IAW AMM 52-41-00, NO DEFECTS NOTED PERFORMED SEVERAL VISUAL INSPECTION OF AVIONICS VENTILATION DUCTS IAW AMM 21-26-42. NO DEFECTS NOTED, DISCREPANCY COULD NOT BE DUPLICATED AT THIS TIME.