As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LHR INFLIGHT T086/22AUG - NUMBER TWO OVEN IN FIRST CLASS GALLEY SMOKING. FLIGHT ATTENDANT TURNED OVEN OFF. CIRCUIT BREAKERS PULLED AND BANDED. CLEANED BURNT RESIDUE FROM NUMBER TWO OVEN IN FIRST CLASS GALLEY. SYSTEM GROUND CHECKED NORMAL OPERATION.