What was found
DUE TO CREW REPORT OF ODOR. PLEASE REPLACE BOTH RECIRCULATION FILTER CARTRIDGES PRECAUTIONARY. REF AMM 21-21-41 ACCOMP IDENT OF CAUSE FOR ODOR AS PER AMM 05-50-00, REPLACED LEFT AND RIGHT RECIRC FILTER CARTRIDGES AS PER AMMM 21-21-41. ACOMP LEVEL A DECONTAMINATION ECS AS PER AMM 21-00-00-615-802 , UNABLE TO DUPLICATE ANY ABNORMAL ODORS ISOLATING APU , LEFT AND RIGHT ENGS BOTH FULL COLD AND FULL HOT , DURING HIGH PWR AND IDLE POWER 15 MIN CYCLES FOR EACH STEP.