What was found
AFT GALLEY FLT ATTENDANTS REPORTED AN ODOR DURING FLIGHT. DE-BRIEFED FLT CREW AFTER INBD FLT ZRH-ORD. PILOTS STATED AT NO POINT DURING THE FLT DID THEY EXPERIENCE ANY SMOKE/ODOR, NO ABNORMAL INDICATIONS IN FLT DECK. 3 FLT ATTEDANTS REPORTED TO FEEL LIGHT HEADED/DIZZY, UPON ARRIVAL TO ORD. PERFORMED GENERAL VISUAL INSP OF ACFT CABIN AREA & GALLEY AREA WITH NO OBVIOUS DEFECTS NOTED, INSPD GALLEY OVENS & FOUND CATERING HAS ALREADY BEGUN REMOVING FOOD FROM INBOUND FLT, AT NO POINT DURING FLT DID ANY OF THE LAVATORY SMOKE DETECTORS GO OFF OR SHOW ANY SIGNS OF SMOKE. AFT GALLEY FLT ATTENDS ALSO REPORTED A POSSIBLE GYM SOCK ODOR ALONG WITH AFT GALLEY WORK LIGHTS FLICKERING INTERMITTENTLY, NO PASSENGERS ON BOARD ACFT REPORTED ANY MEDICAL ISSUES RELATING TO ODOR ISSUES. AIR RECIRCULATION IAW 21-25-01-04 P CD00843F2 MUST REPLACE 2 EA HEPA FILTERS & 4 EA AFT GALLEY BALLASTS. OR BALLASTS AND FILTERS WERE R & R AND WORK IS COMPLETED.