What was found
AIRCRAFT WAS GROUNDED: AFTER TAKEOFF AND AFTER SELECTION OF THE LANDING GEAR UP; DOOR DID NOT CLOSE. ECAM MESSAGE LANDING GEAR DOOR NOT CLOSED APPEARED ON UPPER ECAM DISPLAY. PERFORMED ECAM ACTIONS. AFTER RECYCLING LANDING GEAR DOORS CLOSED AND CONTINUE TO DESTINATION. MAINTENANCE ACCOMPLISHED TSM 32-31-00-810-865-A AND FOUND THE NOSE LANDING GEAR UPLOCK ASSEMBLY FAULTING AND REPLACED IT PER AMM 32-31-21. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED.