What was found
ENROUTE, PILOT REPORTED THE STANDBY ELECTRIC POWER (ON) AND (INOP) ANNUNCIATOR LIGHTS ILLUMINATED. STANDBY POWER SYSTEM WAS INOPERATIVE. PILOT REPORTED SMELLING SMOKE. NO EMERGENCY WAS DECLARED, HOWEVER, THE EMERGENCY EQUIPMENT RESPONDED. AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE STANDBY POWER RELAY AND ALTERNATOR CONTROL UNIT. REPAIRED SHORTED GENERATOR CONTACTOR SENSE WIRE AT GCU. AIRCRAFT WAS RETURNED TO SERVICE. NO CIRCUIT BREAKERS POPPED.