What was found
AIRCRAFT 3141, CREW REPORTED ODOR IN THE CABIN W/APU BLEED ON W/ ENGS OFF. CORRECTIVE ACTION: DETERMINED ODOR CAME FROM APU. NO DEFECTS NOTED FROM EITHER ENGINE. C/W WORKCARD 2100-2005 DUCT BURNOUT COMPLETED W/ NO ODOR IN CABIN. (LP 5471060)