What was found
ODOR IN AFT CABIN AT CRUISE SDR ADDED. UPDATED WITH FORM REF LP 9479753 FOR CORRECTIVE ACTION PERFORM SMOKE/ODOR IN THE FLIGHT DECK/CABIN - CONDITIONAL INSPECTION PER AMM 05-51-26-800-801-C1 PERFORMED SMOKE AND ODOR INSPECTION, RAN BOTH ENGINES, PACKS AND APU NO SMELLS NOTED REF AMM 05-51-26. REMOVED AND REPLACED RECIRCULATION FILTER REF AMM 21-25-01. RAN ENGINES AGAIN, AND VERIFIED NO SMOKE OR ODOR IN CABIN. AIRCRAFT IS OK FOR SERVICE.