As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE, EN ROUTE FROM MEX TO PHX, CREW REPORTED A DIRTY SOCK SMELL IN MID CABIN. FLIGHT LANDED UNEVENTFUL IN PHX. MAINTENANCE DETERMINED ENGINES WERE NOT SOURCE OF SMELL. RAN BOTH ENGINES EXTENSIVELY WITH NO ODOR. FOUND APU AIR INLET AND COMPARTMENT OIL SOAKED. FOUND THE APU ACCESSORY COOLING FAN LEAKING. REPLACED COOLING FAN ASSEMBLY PER AMM 49-52-51-400. OPS AND LEAK CHECKS GOOD.