What was found
AIRCRAFT WAS GNDED. DURING CLIMB, AT GEAR RETRACTION RECEIVED, LG DOOR NOT CLOSED. RECYCLED GEAR IAW ECAM MSG. AFTER LANDING RECEIVED, LG SYS DISAGREE, MSG. R & R THE NLG DOOR ACTUATOR, ACCOMPLISHED LEAK CHECK& PERFORMED SATISFACTORY RETRACTION & EXTENSION OF NLG DEAR DOOR SYS IAW AMM 32-31-16-400-001-A.