What was found
FLT 14 - JFK-FLL - EN ROUTE, THE LGCIU NR 1 FAULTED. AT GEAR EXTENSION CREW OBSERVED XX''S ON GEAR IND WITH TRIANGLE GREEN ON SECONDARY IND. MX CONTROL WAS PATCH TO THE CREW VIA ARINC, MX CONTROL RELAYED THIS WAS PROPER IND. FOR THE LGCIU NR 1 FAULT. THE CREW REQUESTED A ''FLYBY'' AND TOWER CONFIRMED ALL THREE LANDING GEAR WERE EXTENDED. A/C LANDED WITHOUT INCIDENT. DURNIG T/S OF THE LGCIU NR 1 THE INTERROGATION CHECK INDICATED THE RIGHT GEAR UPLOCK SENSOR 8GA WAS FAULTED. THE LGCIU''S WERE SWAPPED AND PROBLEM DID NOT FOLLOW. A/C MX DISCONNECTED, CLEANED AND REPOSITIONED CANNON PLUG FOR THE RT GEAR UPLOCK SENSOR 8GA. FAULT CONDITION CORRECTED.