As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE, FL310 AFT F/A SMELLED FUMES OF DIRTY SOCKS. LEFT PACK IN FULL COLD. WENT TO MANUAL AND WARMER AND SEEMED LIKE FUMES DISSIPATED FOR REMAINDER OF FLIGHT. COMPLIED WITH WORKCARD 2120-2367 STEPS 1 THRU 4. FOUND AFT AIRSTAIR ACTUATOR LEAKING. REMOVED AND REPLACED THE ACTUATOR. FOUND APU INLET CONTAMINATED. CLEANED APU INLET IAW WORKCARD 4900-1184. COMPLIED WITH PNEUMATIC DISTRIBUTION DUCT BURNOUT.