What was found
UPON LOWERING LANDING GEAR, CAPTAIN REPORTED THE NOSE LANDING GEAR UNSAFE LIGHT ILLUMINATED. CREW ACCOMPLISHED A FLYBY OF THE TOWER WHEREAS THE GEAR WAS CONFIRMED DOWN. CREW THEN NOTICED THE AIR/GROUND RELAY AND LIGHTS CIRCUIT BREAKER WAS POPPED. CREW RESET CIRCUIT BREAKER AND RECEIVED A SAFE GEAR INDICATION. FLIGHT LANDED WITHOUT FURTHER INCIDENT. NO EMERGENCY WAS DECLARED. MAINTENANCE CHECKED RETENTION ON CIRCUIT BREAKER P6-2 C21 AIR/GROUND RELAY. NO DEFECTS NOTED. INSPECTED NOSE GEAR PROX SWITCHES, WIRES AND NOSE GEAR. NO DEFECTS NOTED. AIRCRAFT OK FOR SERVICE.