As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: FLIGHT ATTENDANTS REPORTED A MUSTY ODOR WHICH WAS STRONGER IN THE AFT PART OF THE AIRCRAFT. THE ODOR WAS PRESENT DURING ALL PHASES OF FLIGHT. MAINTENANCE ISOLATED THE SOURCE OF THE ODOR TO THE APU AFTER FINDING EVIDENCE OF AN OIL LEAK IN THE APU COMPARTMENT. (OPEN)