As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: BRIEFLY DURING CRUISE, A SWEATY SOCK SMELL WAS EXPERIENCED AROUND 2L. SMELL RETURNED AT ENGINE SHUTDOWN, STRONGER THIS TIME. MAINTENANCE HAS ISOLATED THE SOURCE OF THE ODOR TO THE APU DUE TO EVIDENCE OF OIL LEAKS BEING FOUND **SUPPLEMENTAL REPORT FOR AALA202308037690: MAINTENANCE CLEANED THE APU COMPARTMENT AND ACCOMPLISHED A DECONTAMINATION OF THE ENVIRONMENTAL CONTROL SYSTEM. ** (CLOSED)