As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAXI AFTER APU START FAINT OIL SMELL IN PACKS. APU ON DURING GROUND OPS. FO STAYED ON BOARD. CPT RETURNED TO HEAVIER OIL SMELL THRU COCKPIT VENTS. APU SHUT DOWN AFTER SMELL CLEARED. NO NOTICEABLE HAZE. PER CREW'W FEEDBACK SMELL WAS ONLY NOTICED IN THE COCKPIT. PAX AND F/A DID NOT SMELL ANYTHING. REF LOG 2719822 FOR WORK ACCOMPLISHED COULD NOT DUPLICATE. OK FOR SVC. (LP# 9985310)