What was found
F/A REPORTS FUEL ODOR IN CABIN ROWS 12 AND AFT, STRONGER AFT ON CLIMBOUT. ODOR DISSIPATED DURING THE FLIGHT. C/W AIR CONTAMINATION CHECK LIST FORM 744. NO FUEL AND OIL ODOR NOTED, ARRIVAL AT GATE. INSPECTED AFT CARGO. NO OIL, FUEL ODOR NOTED. INSPECTED NR 1 & NR 2 ENGINE FOR LEAK. NO LEAK NOTED. FOUND NR 2 ENGINE OIL LEVEL AT JUST ABOVE MAX HOT LINE. REMOVED APPROXIMATELY 480 MIL OIL FROM NR 2 ENGINE. NOW OIL LEVEL IS BETWEEN MAX HOT LINE AND ADD 1 QUART LINE. GROUND RUN NR 1 & NR 2 ENGINE IN RATING WITH INDIVIDUAL BLEED AND RECIRCULATING FAN OFF AND ON. NO ODOR NOTED IN CABIN. C/W TROUBLESHOOTING COMMON SMELLS IN ACFT REF FIM MCN 62172-01 ISSUE NR 2, STEP 2A. C/W NR 1 & NR 2 ENGINE SMOKE OR OILY ODOR OR MIST IN THE CABIN FAULT ISOLATION REF FIM 71-00-00-810-817 PAR 1-4A(1). NO CABIN CONTAMINATION NOTED. R & R RECIRCULATION FILTER REF AMM TASK 21-22-22-000-801, 21-22-22-400-801. CLEANED NR 1 & NR 2 ENGINE NACELLE SHUTOFF VALVE FILTER REF AMM TASK 36-11-00-100-801. NO OTHER DEFECT NOTED. RETURNED TO SERVICE.