What was found
ALB/LGA - FLT 4657 - DURING CRUISE, THE 2-AMP LANDING GEAR RELAY CIRCUIT BREAKER TRIPPED. ON APPROACH, THE CREW RESET THE CIRCUIT BREAKER, WHICH TRIPPED AGAIN. THE CREW PERFORMED A MANUAL GEAR EXTENSION LANDING IN LGA WITHOUT INCIDENT. MAINTENANCE WAS DISPATCHED TO THE AIRCRAFT. TROUBLESHOOTING DETERMINED THE LANDING GEAR MOTOR HAD SHORTED INTERNALLY. MAINTENANCE REPLACED THE MOTOR AND RETURNED THE AIRCRAFT TO SERVICE.