As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NRT - FLIGHT ATTENDANTS REPORTED BURNING SMELL IN CABIN FOLLOWED BY STATUS MESSAGE RECIRCULATION FAN. TURNED OFF BOTH FANS AND SMELL DISSIPATED. FLIGHT LANDED NRT WITHOUT INCIDENT. REPLACED LEFT HAND LOWER RECIRCULATION FAN. SYSTEM GROUND CHECK NORMAL OPERATION.