As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: ALL 4 FLIGHT ATTENDANTS (INBOUND) REPORTED FUMES LAST 15 MINUTES OF INBOUND FLIGHT (SMELL OF SOCKS) WITH SINUS AND THROAT IRRITATION. MAINTENANCE FOUND THE APU OIL COOLING FAN O-RING LEAKING AND REPLACED IT PER AMM 49-52-51.