What was found
MIA - FLT 391 - DURING TAKEOFF, THE LGCIU NR 1 FAULT AND AFT CARGO DOOR MSG CAME ON THE UPPER ECAM DISPLAY, DUE TO THIS SITUATION THE AIRCRAFT RETURNED TO MIAMI AIRPORT. AFTER UNEVENTFUL LANDING AT MIAMI AIRPORT, THE CREW REPORTED OVERWEIGHT LANDING. MAINTENANCE TECHS PERFORMED CFDS TEST OF THE LGCIU NR 1, THE AIRCRAFT RETURNED TO NORMAL OPERATION. (M)