As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RETURNED TO DEPARTURE DUE TO LANDING GEAR FAILED TO RETRACT AFTER TAKEOFF, WITH ECAM MESSAGE OF LANDING GEAR NOT UPLOCKED. MAINTENANCE TROUBLESHOOTING AND REPLACED THE RELAY 62GA AS A PRECAUTION. REPLACED GEAR SAFETY VALVE 49GA IAW AMM 32-31-17. AIRCRAFT WAS GROUNDED.