As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
F/A REPORTED DIRTY SOCK SMELL IN AFT CABIN WHILE IN CRUISE. ODER/FUME CHECKLIST PERFORMED. TURNING PACK 2 OFF CLEARED THE ODOR-C/W TSM 05-50-00-810-831-A IDENTIFICATION OF THE CAUSE OF CABIN ODOR OR SMOKE. NO DEFECTS NOTED. CHECKED BOTH ENGINES, NO BIRD INGESTION. CHECKED APU AND BOTH ENGINES OIL LEVEL, OIL LEVEL OK. A/C OK FOR CONTINUED SERVICE.