As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: LANDING GEAR NOT UP LOCKED ECAM MESSAGE ON TAKEOFF FOR NOSE GEAR, CORRECTED ITSELF AFTER APPROXIMATELY 15 SECONDS. MAINTENANCE FOUND NOSE LANDING GEAR DOOR EXTREMELY SLOW TO OPEN AND SOMETIMES WOULD NOT OPEN WITHOUT ASSISTANCE. MAINTENANCE REPLACED RESTRICTOR VALVE 2535GM PER AMM 32-31-57 AND ACCOMPLISHED A SATISFACTORYOPERATIONAL CHECK.