As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: ON FINAL APPROACH INTO MIA DESCENDING THROUGH 11000 FT -1 PITCH CLEAR AIR HEAVY SMELLY SOCK ACRID ODOR. **SUPPLEMENTAL REPORT FOR AALA202111226641: MAINTENANCE FOUND THE APU OIL COOLING FAN O-RING LEAKING AND REPLACED IT PER AMM 49-52-51. A SATISFACTORY LEAK / OPERATIONAL CHECK WAS ACCOMPLISHED** (CLOSED)