What was found
DURING CRUISE, ON THREE OCCASIONS, AN UNKNOWN CHEMICAL TYPE SMELL WAS SMELLED BY ALL CREW FROM WHAT WE THOUGHT WAS THE DUCTING. SMELLED LIKE A TRACE OF OIL BURNING, THEN CEASED, ALL DURING CRUISE. ACCOMPLISHED JOB CARD 26L00021001. APU OVER SERVICED, SERVICED APU TO PROPER LEVEL. PROGRAMMED APU DUCT BURNOUT, ECS DECONTAMINATION IAW JOB CARDS 26L00021002 & 26L00021004.