What was found
GEAR INDICATION MESSAGE, EMERGENCY DECLARED. AIRCRAFT LANDED IN DFW WITHOUT FURTHER INCIDENT, NOT OVERWEIGHT. NOSE GEAR UNSAFE AT HANDLE IN THE UP POSITION, NORMAL DOWN AND LOCK INDICATION. AIRCRAFT WAS GROUNDED. MAINTENANCE REMOVED AND REPLACED NOSE GEAR UP & DOWN LOCKED SENSOR AND PERFORMED SATISFACTORY OPERATIONAL CHECK IAW AMM 32-60-05.