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 NOSE GEAR FAILED TO RETRACT DURING GEAR RETRACTION. COMPLETED ECAM ACTIONS TO NO EFFECT. AFTER CYCLING GEAR, ECAM HYD G RSR LVL MESSAGE APPEARED. NO GREEN HYDRAULIC FLUID INDICATED. REPLACED CASE DRAIN FILTERS, AND LOWER HYDRAULIC UNION ON NOSE LANDING GEAR DOWN LOCK ACTUATOR.