As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED. ODOR REPORTED ON APPROACH BY FLIGHT ATTENDANT AT APPROX. 3000' AGL. NOTICED A MUSTY DIRTY SOCKS ODOR IN THE COCKPIT AT THE SAME TIME AFTER LANDING FLIGHT ATTENDANT REPORTED BURNING SENSATION IN NOSE. FOUND EXTERNAL LEAK ON APU AND EVIDENCE OF OIL IN THE INTAKE. REPLACED THE APU ASSEMBLY.