B767 FLT ATTENDANT DETECTS ELECTRICAL FUMES IN THE CABIN DURING TRANSATLANTIC FLIGHT AND RESOURCEFUL OFF DUTY FO LOCATES THE SOURCE IN A SEAT CONTROL AND DISABLES IT.

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I WAS THE FO AND OUR POS WAS SOMEWHERE OVER THE ATLANTIC DURING THE FOLLOWING EVENT. I WAS ON SECOND BREAK WHEN APCHED BY A FLT ATTENDANT CONCERNED ABOUT SOME FUMES THAT HE SMELLED IN BUSINESS CLASS. THE AREA OF CONCERN WAS ISOLATED TO THE CTL PANEL OF THE LUMBAR CTL OF A SEAT. AFTER INITIALLY DISCOVERING THE FUMES I SPOKE WITH THE CAPT VIA THE INTERPHONE TO INFORM HIM OF THE SITUATION. I TOLD HIM WE WERE INVESTIGATING SOME FUMES IN THE BUSINESS CLASS SECTION OF THE ACFT. THE SMELL OF THE FUMES SEEMED TO BE COMING FROM AN ELECTRICAL SOURCE OR HOT; BURNING PLASTIC. WE QUICKLY ISOLATED THE FUMES TO BE ORIGINATING FROM THE SEAT CTLS. I ASKED THE FLT ATTENDANTS TO SECURE ALL KNOWN PWR TO THE PAX SEATS WHILE I UPDATED THE CAPT VIA INTERPHONE. THE FLT ATTENDANTS SECURED ALL AUDIO AND VIDEO PWR TO THE CABIN PAX SEATS. DURING MY CONVERSATION WITH THE CAPT A FLT ATTENDANT APCHED ME WITH A FIRE EXTINGUISHER IN HAND AND INFORMED ME THAT SMOKE WAS NOW VISIBLY COMING OUT OF THE LUMBAR CTL PANEL TO THE SEAT. I TOLD HIM TO MONITOR THE SITUATION AND TO DISCHARGE THE FIRE EXTINGUISHER IF FLAMES APPEARED. I UPDATED THE CAPT WITH THIS INFO AND WE DECIDED TO SECURE THE UTILITY BUS SWITCHES. THE SMOKE DISSIPATED QUICKLY ONCE THE UTILITY BUS SWITCHES WERE TURNED OFF. I USED A SMALL STRAIGHTEDGE TO LOOSEN THE SCREWS TO THE LUMBAR CTL PANEL AND REMOVE THE DEFECTIVE PANEL. THE DEFECTIVE PART WAS VISIBLY OBVIOUS. I UPDATED THE CAPT WITH THE SITUATION. HE INSPECTED THE DEFECTIVE PANEL AND AS A CREW; PLTS AND FLT ATTENDANTS; DECIDED THE SITUATION WAS ISOLATED AND COMPLETE. PWR WAS RESTORED AND THE FLT CONTINUED WITHOUT INCIDENT. I AM UNSURE WHAT OUTSIDE COMS THE CAPT MADE DURING THE INCIDENT. I FELT HE WAS COMMUNICATING WITH OUTSIDE SOURCES; GIVING THEM THE INFO I WAS RELAYING TO HIM. AFTER THE INCIDENT WAS OVER; I CONTINUED ON BREAK AND ASSUME MAINT AND DISPATCH WAS NOTIFIED SINCE WE CONTINUED WITHOUT DIVERTING.