A B767-300ER IN CRUISE AT FL330 DECLARED AN EMER AND DIVERTED DUE TO SMOKE IN THE FORWARD GALLEY AREA AND DOOR 1L; WHICH WAS CAUSED BY AN OVERHEATED OVEN.

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AT XA:21Z; I WAS CALLED BACK FROM MY BREAK. I PASSED THROUGH THE AFFECTED AREA AND SAW NO SMOKE. BUT; I DID SMELL IT NEAR DOOR 1L AND IN THE FS1 LAV. THE PURSER INFORMED ME SHE HAD DE-POWERED THE POWER PORTS AND THAT A NON-REV IN SEAT XX SAID THE FLOOR FELT HOT UNDER HIS FEET. I RETURNED TO THE FLT DECK TO FIND US DIVERTING TOWARD ZZZZ AND THAT THE FIRST THREE ITEMS OF THE CABIN FIRE CHKLIST HAD BEEN ACCOMPLISHED. THE CAPT ORDERED US TO DECLARE AN EMER; CONTACT ZZZZ OPS SUPPORT; INFORM DISPATCH OF THE SIT; AND START DUMPING FUEL. I THEN CLEANED UP THE CABIN FIRE CHKLIST EXPANDED ITEMS. FUEL DUMPING WAS FINISHED BY ABOUT 6000 FT MSL. THE LNDG WAS OVERWEIGHT BUT VERY SMOOTH ON TOUCHDOWN. FLT ATTENDANTS STAYED IN CONTACT AND SAW NO FURTHER PROBS IN THE BACK; SO WE TAXIED TO A HARDSTAND AND DEPLANED THE PAX WITH STAIRS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: ON REACHING THE GALLEY; NO VISIBLE SMOKE WAS NOTED BUT COULD BE SMELLED THROUGHOUT THE GALLEY AND DOOR 1L OVERHEAD AREA. WHAT STRUCK THE RPTR AS ODD WAS THE RPT OF SMOKE COMING FROM THE OVERHEAD PANEL OF DOOR 1L. THE PURSER HAD ALREADY SWITCHED OFF ALL THE POWER TO THE SEAT POWER PORTS AND ADVISED THAT A PAX HAD RPTED THAT THE FLOOR FELT HOT UNDER THE SEAT. THE CAPT DECLARED AN EMER AND DIVERTED. THE AIRPLANE WAS SCANNED FOR ANY FIRE OR OVERHEAT CONDITIONS AND NONE WERE DISCOVERED UNTIL MAINT SWITCHED ON THE #1 OVEN IN THE GALLEY AND IT SHORTLY OVERHEATED TO AN ABNORMALLY HIGH TEMP. THE CIRCUIT BREAKER POWERING THIS OVEN NEVER TRIPPED IN THE AIR OR ON TEST ON THE GND. SUPPLEMENTAL INFO FROM ACN 655363: AT APPROX 2 HRS INTO THE FLT ABOUT 60 MILES E OF THE INTXN; OCEANIC ENTRY POINT; THE NUMBER 1 FLT ATTENDANT CALLED THE COCKPIT AND SAID SHE HAD SMOKE POURING OUT OF THE OVERHEAD JUST ABOVE THE 1L DOOR AND IT SMELLED LIKE ELECTRICAL SMOKE. SHE IMMEDIATELY TURNED OFF THE POWER PORTS AND WE IMMEDIATELY PERFORMED THE CABIN FIRE/SMOKE PROC; TURNING OFF THE UTILITY BUSSES; RECIRC FANS AND THE RIGHT AC PACK; AS CALLED FOR IN THE IMMEDIATE ACTION ITEMS (SHORTLY THEREAFTER THE CLEANUP OF THAT PROC WAS COMPLETED). THE RELIEF PLT WAS ON BREAK AND I TOLD THE FLT ATTENDANT TO AWAKEN HIM TO ASSES THE SIT AND TO STAY ON THE PHONE TO KEEP US INFORMED. THE RELIEF PLT INFORMED ME BY PHONE THAT IT APPEARED TO BE ELECTRICAL SMOKE AND THAT IT WAS SUBSIDING; BUT THAT A PAX IN XX; MR X; HAD INDICATED THAT THE FLOOR BENEATH HIS FOOT WAS VERY HOT. WITH THAT INFO I DECLARED AN EMER AND ASKED FOR VECTORS TO ZZZZ; UPON WHICH WE RECEIVED VECTORS TO RWY 5 ILS. WE STILL HAD FUEL IN THE CENTER TANK AND I ELECTED TO DUMP FUEL IN ORDER TO GET DOWN TO MAXIMUM LNDG WEIGHT. FUEL WAS DUMPED OVER WATER AT 7000 FT AND STOPPED AT 5000 FT APPROX 6000 LBS. ACFT WEIGHT AT LNDG WAS 335000 LBS; AND AN OVERWEIGHT LNDG WAS MADE WITH A SMOOTH TOUCHDOWN; 1-200 FPM; WITH MINIMAL BRAKING (FROM THE TIME NOTIFIED OF THE SMOKE TO LNDG WAS 19 MINS). CRASH AND FIRE RESCUE EQUIP MET THE ACFT ON LNDG; AND AS THERE WAS NO CONTINUING SMOKE OR FIRE; I ELECTED TO TAXI TO THE GATE. ONCE THERE; CFR CREWS SCANNED THE ACFT FOR FIRE WITH NO EVIDENCE THEREOF. PAX AND CREW DEPLANED VIA JET STAIRS WITH NO INJURIES. CFR CREWS WENT OVER ACFT WITH A DEVICE FOR CHKING FOR FIRE. NONE WAS FOUND; ONLY THE SMELL OF ELECTRICAL SMOKE WAS EVIDENT. MAINT THEN REINSTATED THE ELECTRICAL BUSSES THAT WERE ISOLATED. AFTER SEVERAL MINUTES; IT WAS FOUND THE #1 OVEN HAD APPARENTLY HEATED TO AN ABNORMALLY HIGH TEMP PRODUCING SMOKE THAT VENTED TO THE OVERHEAD AND WAS ESCAPING OVER THE 1L DOOR. THIS LED THE FLT ATTENDANT TO BELIEVE SHE HAD A PROB IN OVERHEAD CEILING RATHER THAN THE OVEN. THE #1 OVEN FORWARD GALLEY CIRCUIT BREAKER HAD APPARENTLY NEVER POPPED; AND ACCORDING TO MAINT IT WAS EXTREMELY HOT AND SHOULD HAVE. AFTER MAINT REMOVED THE OVERHEAD PANELS AND DETERMINED THERE WAS NO DAMAGE TO THAT AREA AND THE AREA AROUND THE OVEN; THEY PLACARDED THE OVEN; SIGNED THE LOGBOOK FOR THE OVERWEIGHT LNDG; ETOPS INSPECTION; AND RELEASED THE ACFT FOR FLT.THE FLT CONTINUED TO ZZZZ2 WITH NO FURTHER INCIDENCE. BOTH THE FO AND RELIEF PLT AND ALL THE FLT ATTENDANTS ACTED AND PERFORMED IN A VERY PROFESSIONAL AND COMPETENT MANNER; SOMETHING THE AIRLINE SHOULD BE PROUD OF.