What was found
(CAN)LANDING GEAR SELECTED UP ON CLIMB DEPARTURE, ECAM MESSAGE WARNING INDICATED NOSE GEAR NOT UPLOCKED, NOSE LDG REMAINED EXTENDED. LANDING GEAR SELECTED DOWN, BOTH MAIN LANDING GEAR REMAINED RETRACTED. L ANDING GEAR THEN SELECTED UP AND NORMAL OPERATION OCCURRED. THE FOLLOWING MAINTENANCE ACTION TOOK PLACE, NOSE LANDING GEAR SENSORS INSPECTED SATISFACTORILY, TARGETS (GAPS) CHECKED: 24GA ADJUSTED AND TARGETS 36GA AND 38GA FOUND LOOSE AND WERE SECURED.