What was found
(CAN) THE PILOT WAS DOING NIGHT TRAINING LOCALLY WHEN HE NOTICED THE LOW VOLTAGE INDICATOR LIT AND THE AMMETER SHOWING A DISCHARGE. HE FOUND THE ALTERNATOR CIRCUIT BREAKER TRIPPED.THE BREAKER WAS RESET WHICH RESULTED IN SOME SMOKE AND SPARKS FROM UNDER THE PANEL. THE LOW VOLTAGE INDICATOR WAS STILL LIT AND THE AMMETER STILL SHOWING DISCHARGE.THE PILOT SHUT DOWN THE ALTERNATOR SYSTEM AND RETURNED UNEVENTFULLY TO THE AIRPORT. INVESTIGATION REVEALED THE ALTERNATOR CIRCUIT BREAKER FAILED IN THE CLOSED POSITION.CIRCUIT BREAKER REPLACED IN ACCORDANCE WITH CESSNA SERVICE LETTER SE76-15.