What was found
AT 4.5 HOURS INTO FLIGHT FUMES IN AFT GALLEY COMING FROM AIR VENTS (OVEN OPENED AND NOT SMELLING) PER A/C SMOKE/FUME CHECK LIST BOTH RECIRC FANS TURNED OFF, FUMES STOPPED. REMOVED AND REPLACED RIGHT RECIRCULATION FAN PER AMM 21-25-01, ALSO REMOVED AND REPLACED RECIRC FAN FILTER PER AMM 21-25-02. OPS TESTED GOOD PER AMM 21-25-00. ROTABLE PARTS CHANGE WAS INDICATED - TT 1359577, S/N OFF 00503 FAN, AIR, CABIN OFF 53-2125-9-0001 0503 ON 53-2125-9-0001 0433.