As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
JFK INFLIGHT - NUMBER ONE OVEN IN FIRST CLASS SMOKING WHILE IN USE. OVEN WAS TURNED OFF AND SMALL PATCH CONTINUE TO GLOW AT LEFT SIDE OF HEATING ELEMENT. RETURNED TO JFK AND LANDED WITHOUT INCIDENT. CLEANED BURNED DEBRIS AND GREASE ON HEATING ELEMENT FOR NUMBER ONE OVEN. SYSTEM GROUND CHECKED NORMAL OPERATION.