As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: FLIGHT CREW REPORTED DIRTY SOCK SMELL WITH APU ON - MAINTENANCE FOUND THE APU AIR INTAKE PLENUM ASSEMBLY SATURATED IN OIL AND NOTED OIL OUTSIDE THE FCU DRAIN - MAINTENANCE REPLACED THE FCU *AALA202608215048* AND THE APU INTAKE PLENUM ASSEMBLY *AALA202608216718* - A DECONTAMINATION OF THE ENVIRONMENTAL CONTROL SYSTEM WAS ACCOMPLISHED WITH NO LEAKS OR ODORS NOTED