As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, EN ROUTE, A BURNING ODOR WAS REPORTED IN THE AFT CABIN. INTENSITY WAS INCREASING UNTIL GALLEY POWER RE-CIRCULATION FAN WAS SELECTED OFF. TURNED BACK TO PHX AND LANDED WITHOUT FURTHER EVENT. MAINTENANCE FOUND THE AFT LT COFFEE MAKER OVERHEATING. REMOVED AND REPLACED THE AFT LT COFFEE MAKER IAW T/C R1D25001, OPERATIONAL CHECK WAS GOOD.