What was found
AFTER TAKEOFF FROM KBGR THE PILOT REPORTED THE 26 VAC CIRCUIT BREAKER TRIPPED. AFTER RESET CIRCUIT BREAKER, SMOKE NOTED FROM CIRCUIT BREAKER. PILOT RETURNED TO KBGR AND LANDED WITHOUT INCIDENT. MAINTENANCE TRAVELED TO KBGR AND INSPECTED THE COMPASS SYSTEM AND FOUND THE RMI SERVO AMPLIFIER HAS INTERNAL SHORT CAUSING THE CIRCUIT BREAKER OVERLOAD. AIRCRAFT WAS REPOSITIONED TO MHT VIA SPF DATED 06/24/2020. MAINTENANCE REMOVED AND REPLACED RMI SERVO AMPLIFIER IAW COMPASS SYSTEM I/M. OPS CHECK SATISFACTORY.