As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOG PAGE 8209449 - FLT 1543 CLT-SEA - EMERGENCY LANDING - LANDING GEAR FAILED TO EXTEND. NO DOWN INDICATION ON LANDING GEAR PANEL OR WHEEL ECAM PAGE. CAPTAIN HAD TO DO A MANUAL GEAR DOWN AND DECLARED AN EMERGENCY. AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED THE LANDING GEAR CONTROL INTERFACE UNIT.