As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
1.5 HOURS INTO FLIGHT, THE NR 3 OVEN STARTED SMOKING. FLIGHT ATTENDANTS TURNED IT OFF AND WERE DIRECTED TO PULL THE CIRCUIT BREAKER FOR THAT OVEN. FLIGHT ATTENDANTS REPORTED THAT SMOKE DISSIPATED AND SMELLED LIKE BURNING PAPER. MAINTENANCE REMOVED DEBRIS FROM #3 OVEN HEATING ELEMENT AND PERFORMED SATISFACTORY OPERATIONAL CHECK PER MM 25-35-19.