What was found
AIRCRAFT WAS GROUNDED: DURING APPRAOCH INTO CLT FLIGHT CREW REPORTED GEAR INDICATION ISSUE, THERE WERE 3 GREEN LIGHTS BUT GEAR PAGE SHOWED XX'S ON THE GEAR DOOR RIGHT SIDE AND A LGCIU 2 FAULT MESSAGE DISPLAYED. THE CREW ACCOMPLISHED A FLY BY THE TOWER FOR VERIFICATION THAT THE GEAR WAS DOWN. THE TOWER VERIFIED THE GEAR WAS DOWN AND THE AIRCRAFT LANDED SAFELY WITHOUT FURTHER INCIDENT. (NOTE: NO EMERGENCY WAS DECLARED) MAINTENANCE REPLACED MAIN LANDING GEAR DOOR SENSOR 28GA PER AMM 32-31-73 AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK. A BITE TEST OF THE #1 AND #2 LGCIU'S WAS ACCOMPLISHED WITH NO FAULTS NOTED.