As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: PILOT REPORTS FUME EVENT AFTER APU AIR BROUGHT ON LINE. MAINTENANCE ACCOMPLISHED CABIN AIR QUALITY TROUBLESHOOTING CARD 26L00021001. FOUND APU TO BE THE SOURCE (INTERNAL OIL LEAK).***SUPPLEMENTAL INFORMATION: MAINTENANCE REPLACED THE APU IAW CARD 26L31049003.***(CLOSED)