What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO MIA DUE TO THE FLIGHT CREW REPORTING A LANDING GEAR LGCIU 2 FAULT AFTER TAKEOFF. THE AIRCRAFT LANDED SAFELAT MIA AND TAXIED TO THE GATE UNDER ITS OWN POWER. MAINTENANCE ACCOMPLISHED BITE / SYSTEM REPORT FOR LGCIU #2 PER TSM 32-31-00-810-872-A AND FOUND FAULT ON SENSOR 29GA. MAINTENANCE REPLACED LEFT LANDING GEAR DOOR UPLOCK SENSOR 29GA AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 32-31-73 WITH NO FAULTS NOTED.