As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LANDING GEAR FAILED TO RETRACT, FOLLOWED ECAM AND QRH GEAR HANDLE DOWN AND RETURNED TO LAND. SYSTEM B WAS USED AND SYS A DID NOT WORK EITHER. REMOVED AND REPLACED LANDING GEAR ELECTRO HYDRAULIC SELECTOR VALVE 3GA PRECAUTIONARY. PERFORMED LEAK CHECK SATISFACTORY. WORK PERFORMED IAW AMM 32-31-12-4.