What was found
PHX FLT 0132 EN ROUTE LAS TO PHX. ON TAKEOFF, WITH THE GEAR HANDLE SELECTED UP, A RED ECAM MESSAGE FOR GEAR UNSAFE, GEAR NOT DOWN WAS GENERATED. THE GEAR WAS RECYCLED AND THE MESSAGE CLEARED. THE FLIGHT CONTINUED WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED LGCIU 1 AND 2. OK FOR SERVICE.