As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE PILOT REPORTED AN AIR RETURN, DUE TO A NOSE GEAR SHIMMY. A GEAR RETRACTION ECAM MESSAGE FOR THE LANDING GEAR DOOR NOT CLOSED WAS OBSERVED. AN EMERGENCY WAS DECLARED AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE NLG DOOR CLOSING SAFETY VALVE AND WELL AS THE LANDING GEAR CONTROL INTERFACE UNIT. PERFORMED A SATISFACTORY RETRACTION AND EXTENSION IAW AMM 32-31-00-720-002-A.