As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT SMOKE DETECTORS SOUNDED AND FLT ATTNS REPORT SMELLING UNIDENTIFIABLE ODOR WHEN AIRFOIL A/I IN USE. ALARMS STOPPED 1.5 MIN AFTER A/I OFF. MTC FOUND OIL AT APU INLET APPEARS TO BE COMING FROM INSIDE APU. PERFORMED DUCT BURNOUT. REPLACED APU FOR OIL LEAK.