As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING APPROACH AFT RIGHT LAV SMOKE ALARM SOUNDED AND SMOKE/SMELL WAS REPORTED THRU OUT THE AC. FLIGHT CREW SHUTOFF RIGHT PACK AND APU AIR SWITCH AND SMELL CEASED. FLIGHT CREW PERFORMED AN UNEVENTFUL LANDING AT DESTINATION AIRPORT. MAINTENANCE FOUND EVIDENCE OF APU OIL LEAK AND INGESTION INTO APU AIR INTAKE. APU EXTERIOR CLEANED. APU GROUND RUN AND NO LEAKS FOUND. COALESCER BAGS WERE REPLACED, PACK BURNOUT PERFORMED AND COALESCER BAGS CHANGED ONCE MORE.