As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: THE AIRCRAFT DECLARED AN EMERGENCY AND DIVERTED TO DFW DUE TO A DIRTY SOCK SMELL ORIGINATING IN THE AFT GALLEY AREA THAT TRAVELED TO THE LAST 3 ROWS. SMELL WAS NOTICED AT CRUISE AND BECAME STRONGER DURING DECENT AND LANDING. THERE WERE NO PASSENGERS LOCATED IN THE LAST THREE ROWS. THE AIRCRAFT LANDED SAFELY AT DFW WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND THE APU FUEL CONTROL UNIT LEAKING AND REPLACED IT PER AMM 49-32-11. A SATISFACTORY LEAK / OPERATIONAL CHECK WAS ACCOMPLISHED WITH NO ODORS NOTED.