As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A STRONG MUSTY ODOR FOR THE LAST 5 MINUTES OF FLIGHT IN COCKPIT AND CABIN. APU WAS OFF AT THE TIME. THE AIRCRAFT WAS GROUNDED. APU FACTORY GEAR BOX PLUG LEAKING OIL DOWN ON INLET AND INGESTED, IN INTAKE. MAINTENANCE REMOVED AND REPLACED THE APU IAW CARD 26L31049003. OPS CHECKED GOOD.