What was found
TAXI OUT-FUMES IN COCKPIT / CABIN. INSPECTED APU COMPARTMENT FOR LEAKS AND ANY SIGNS OF ABNORMAL CONDITIONS REF. 05-50-00-810-831-A. NO OIL RESIDUE OR LEAKS OBSERVED. APU OIL LEVEL IS AT FULL MARK. RAN BOTH PACK OFF APU , RAN FOR 30 MINS , RAN IN NORMAL & HIGH, NO SMELL NOTED , CHECKED EACH GALLEY , COFFEE MAKERS, OVENS , AND CHILLERS,ALL LAV CHECKALSO ALL NORMAL, WALKED THROUGH CABIN AND IN COCKPIT NO SMELL NOTED, RAN BOTH ENGINES AND OPERATED BOTH PACKS. NO SMELL OR ODOR DETECTED. CHECKED FOR OIL LEAKS AT APU NO LEAKS NOTED REF AMM 05-51-10-200-801-C-1 REMOVED AND REPLACED RECIRCULATING FILTERS REF AMM 21-21-41/401 REF ENGINE RUN TEST NR 3 : IDLE LEAK CHECK REFERENCE: TASK 71-00-00-710.