What was found
CREW REPORTED AN ODOR DURING CLIMB OUT, CHECKED AT CRUISE, ALL OK, DURING DESCENT, FA NOTIFIED OF AN ODOR AGAIN. IN THE COCKPIT, ODOR WAS LIGHT. FOUND EVIDENCE OF OIL CONTAMINATION AT THE GEARBOX DUCT ON THE NR 2 ENGINE. R & R THE SEAL ASSY AND MATING RING IAW AMM 72-60-31, AND 72-60-28. LEAK CHECKED GOOD. AS A PRECAUTION, REMOVED AND REPLACED THE NR 1 ENGINE SEAL ASSY AND BOTH LT AND RT RECIRCULATION FILTERS IAW AMM 21-21-41, AND 72-60-31. LEAK CHECKED GOOD. PERFORMED ECS DECONTAMINATION IAW AMM 21-00-00. NO ODORS PRESENT. ACFT OK FOR CONTINUED SERVICE.