As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT GALLEY HAS A PIZZA OVEN OR MAYBE A CAMP FIRE SMELL STARTED ON THE GROUND W/ APU ON ALL OVENS AND COFFEE MAKERS ARE OFF. TURNED CAB/UTIL AND IFE/PASS SEAT SWITCHES OFF AS WELL AS EQUIP COOLING TO ALTN. SMELL STILL PERSIST. PULLED CBS ON BACK FA PANEL AND STILL HAD SMELL OF FIRE. TURNED A/C COMPLETELY OFF TO BLUE LIGHT NO BATT OR EXT POWER SMELL DISSIPATED/WENT AWAY. GROUNDED - YES. ON DEFERRAL.