As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: DURING CRUISE FLIGHT ATTENDANT SMELLED ACRID/BURNING SMELL FROM AFT GALLEY FROM UNKNOWN SOURCE. FOLLOWED QUICK REFERENCE HANDBOOK AND SHED THE GALLEY & CAB VIA FLIGHT DECK PUSH BUTTON. THE SMELL STOPPED INCREASING AND SLOWLY DECREASED, HOWEVER NEVER FULLY DISSIPATED. ARMS CODE 21801100. REPLACED AFT GALLEY COFFEE MAKER PER AMM 25-35-15.