As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DECENT AT 2,500FT, CREW DECLARED AN EMERGENCY AND DONNED O2 MASKS DUE TO FUMES IN THE FLIGHT DECK. ARFF INSPECTED A/C ON TAXIWAY WITH NTF. MTC FOUND APU INLET CONTAMINATION WITH OIL. PERFORM LEVEL B ECS DECONTAMINATION. APU PLACED ON MEL FOR CLEANING AND LEAK TROUBLESHOOTING. (LP: 7653266)