What was found
(CAN) AFTER LANDING, PILOT AND INSTRUCTOR NOTICED WHINING NOISE COMING FROM UNDER DASH. CHECKED ENGINE INSTRUMENTS NOTICED ALTERNATOR WAS SHOWING HIGH DISCHARGE. NOISE STOPPED ALL OF A SUDDEN, ALTERNATOR NO LONGER DISCHARGING. CHECKED CIRCUIT BREAKERS NOTICED GEAR PUMP BREAKER POPPED. ACFT BROUGHT INTO HANGAR, PLACED ON JACKS. GEAR PUMP BREAKER WAS RESET. GEAR WAS RETRACTED AT END OF CYCLE THE PUMP WOULD NOT SHUTDOWN. CIRCUIT BREAKER HAD TO BE PULLED TO STOP PUMP. THIS IS SAME PROBLEM ACFT HAD 53 HRS AGO BUT THAT TIME THE MOTOR OVERHEATED, CAUSING SMOKE IN COCKPIT BEFORE BLOWING BREAKER. HYD POWER PACK WILL BE REPLACED AGAIN.