As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: MAINTENANCE REPORTS DURING APU OPERATION, OIL SMELL IN CABIN WITH ONLY APU BLEED ON. MAINTENANCE FOUND EVIDENCE OF OIL LEAK AROUND THE APU FAN ASSEMBLY. APU WAS REPLACED IAW CARD 26L31049005. NO FURTHER ODORS NOTED.