As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: CABIN CREW REPORTS DIRTY SOCK SMELL DESCENDING THROUGH 13000 FEET. APU OFF. SKY CLEAR. MAINTENANCE ACCOMPLISHED THE SMOKE / ODOR / FUME TROUBLESHOOTING TASK CARD 26L00021001 WITH NO FINDINGS NOTED. MAINTENANCE REPLACED THE RECIRCULATION FILTERS AS A PRECAUTIONARY MEASURE PER AMM 21-21-41. MAINTENANCE REPORTED THAT NO SMELL NOTED AFTER MAINTENANCE.