As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OVEN OVERHEAT, FLT DIVERTED. OVEN OVERHEAT LEAD CABIN CREW TO DISCHARGE HALON FIRE EXTINGUISHER INTO THE OVEN. NO FLAMES WERE EVER OBSERVED AND ANY OVERHEAT WAS CONTAINED WITHIN THE OVEN. FWD GALLEY HALON FIRE EXTINGUISHER WAS REPLACED. REPLACED FWD OVEN. OPS OKAY.