As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT FLIGHT ATTENDANTS SAY THEY SMELLED "DIRTY SOX SMELL" FOR A MINUTE FROM LAV DOOR + IN AFT GALLEY, BUT IT DISSIPATED. APPLIED TSM 05-50-00-810-831-A. PERFORMED AUTOMATIC ENGINE RUN FOR 20 MINUTES, IAW AMM 71-00-00-860-823-A AND INSP APU IAW AMM 49-00-00-200-816-A. COULD NOT DUPLICATE ODOR. NO LEAKS FOUND. NO FUMES DETECTED. A/C OK FOR CONTINUED SERVICE.