As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHORTLY AFTER TAKEOFF, SMOKE AND FIRE WAS REPORTED IN AFT GALLEY NR 2 OVEN. HAND FIRE EXTINGUISHER WAS DISCHARGED INTO OVEN. AIRCRAFT RETURNED TO DEPARTURE STATION AND MADE AN UNEVENTFUL LANDING. INVESTIGATION REVEALED THAT FOOD HAD SPILLED OUT OF TRAYS ON TO HEATING ELEMENT.