As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLAP EXTENSION ON ARRIVAL, FLAPS STOPPED MOVING BETWEEN 1 & 5 AND EICAS MESSAGE T/E FLAP ASYMMETRY WAS DISPLAYED. PERFORMED T/E FLAP ASYMETRY CHECKLIST IN QRH. COMPLETED CHECKLIST, DECLARED AN EMERGENCY AND LANDED WITHOUT INCIDENT.