As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LHR - CREW REPORTED BUSINESS CLASS GALLEY OVEN NUMBER 4 HAD STRONG SMELL OF BURNING ELECTRICAL ODOR. CREW SHUT OFF OVEN AND PULLED CIRCUIT BREAKER. FLIGHT LANDED LHR WITHOUT INCIDENT. DEFERRED NUMBER 4 OVEN AS INOPERATIVE. SYSTEM GROUND CHECK NORMAL OPERATION.