As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT, SMOKE WAS REPORTED IN THE NR2 GALLEY AREA. UTILITY BUSES WERE SWITCHED OFF, FUEL WAS DUMPED AND THE ACFT RETURNED TO DEPARTURE. MX FOUND OVENS 2-45 & 2-46 WITH MELTED PLASTIC AND REPLACED BOTH OVENS, CONTROLLERS AND SEVERAL RELAYS. OPS CHECK WAS GOOD.