As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#1668, PUJ-SJU. (AIRCRAFT PERFORMED ANA IR TURN BACK TO PUJ). 'DIRTY SOCKS SMELL IN AFT OF AIRCRAFT; ACCOMPLISHED INFO NOTICE 2017-T015 UNABLE TO LOCATE SOURCE OF ODOR BOTH PACKS TO BE PLACED ON MEL AND AIRCRAFT REPOSITIONED TO AN MX BASE FOR FURTHER TROUBLESHOOTING.'