As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: ON APROACH AT 2500" CREW PUT GEAR HANDLE DOWN AND GOT LANDING GEAR NOT DOWN / LOCKED ECAM MESSAGE. CREW FOLLOWED ECAM PROCEDURE AND ACCOMPLISHED A MANUAL GEAR EXTENSION. AN EMERGENCY WAS DECLARED AND THE AIRCRAFT LANDED SAFELY WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED THE GEAR SELECTOR VALVE ASSEMBLY AND ACCOMPLISHED A SATISFACTORY LEAK / OPERATIONAL CHECK PER AMM 32-31-31.