A B777 CREW IN CRUISE FLT WAS NOTIFIED BY FLT ATTENDANT OF A BURNING ODOR AND SMOKE ASSOCIATED WITH AN OVEN. THEY DECLARED AN EMER AND DIVERTED TO DUB.

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WHILE CRUISING AT FL370; A BUSINESS CLASS FLT ATTENDANT NOTIFIED US A BURNING ODOR WHICH APPEARED TO BE OF AN ELECTRICAL ORIGIN. IT APPEARED TO BE EMANATING FROM WARMING OVEN '547' AND I DIRECTED ALL PWR TO BE REMOVED FROM THE GALLEYS. THE FLT ATTENDANT STATED THAT THE ODOR WAS STILL PRESENT AND I THEN ASKED FO WHO HAD JUST BEGAN HIS BREAK TO ASSIST WITH THE TROUBLESHOOTING. THE CARTS WERE REMOVED FROM THE STORAGE AREA BELOW THE OVEN AND A HAZY SMOKE WITH A NOXIOUS ODOR WAS POOLING IN THAT AREA. AN EMER WAS DECLARED WITH CTR AND ZZZZ WAS MY CHOICE FOR THE DIVERT BASED UPON TIME. WE DUMPED FUEL BTWN FL340 AND 15000 FT AND THE EXACT LOCATION WAS UNKNOWN DUE TO WORKLOAD INCLUDING THE 'SMOKE/FUME' CHKLIST. I CAN RELAY THE FACT THAT WE WERE OVERWATER DURING THE FUEL DUMP ACCOMPLISHMENT. THE LNDG WT WAS APPROX 459000 LBS AND CFR WAS AWAITING OUR ARR. AFTER STOPPING THE ACFT ON THE TXWY; CFR THOROUGHLY INSPECTED THE EXTERIOR VISUALLY AND WITH THERMAL IMAGING EQUIP. WE RECEIVED A NORMAL FINDING FROM THEM AND HAD THE TRUCKS FOLLOW US TO THE ASSIGNED PARKING STAND. PAX WERE DISEMBARKED QUICKLY VIA MOBILE STAIRS. CONTRACT MAINT PROVIDED A VERY THOROUGH INSPECTION AND DETERMINED THAT NO DAMAGE WAS EVIDENT FROM THE OVERHEATED WARMING OVEN. THE REMAINING PORTION OF THE GALLEY WAS RE-PWRED FOR 1 HR WITH NO FURTHER SYMPTOMS AFTER ISOLATING PWR TO THE FAULTY COMPONENT. THERE WAS A PREVIOUS PIREP ENTERED IN THE LOGBOOK REFLECTING A TEMP RELATED ISSUE ON THIS OVEN.