As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR COND HAS AN OILY SMELL WHETHER USING ENG BLEED OR APU BLEED. RAN ENGINES ISOLATED TO NR 1 ENGINE SMELLS THE STRONGEST IN THE COCKPIT APU WAS LEAKING OIL AND HAVING IT SUCKED INTO INLET. REPLACED APU REF MM 49-11-11. OPS CHECKED NORMAL. RAN ENGINES AND APU. NO LONGER GETTING STRONG OIL SMELL.