As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED A DIRTY MUSTY ODOR IN AFT CABIN. SHORTY AFTER, SMOKE DETECTOR FAULTED, ABOUT 10 MINUTES BEFORE LANDING. MAINTENANCE INSPECTED APU COMPARTMENT AND FOUND APU OIL COOLER LEAKING OIL. R & R APU OIL COOLER FAN ASSY IAW AMM 49-52-51. OPS AND LEAK CHECKED GOOD.