What was found
(CAN) ON 2/12/04, AT 22:30 THE A/C WAS IN CLIMB OUT OF YYQ. SMOKE AND FUMES WERE NOTED IN THE CABIN, AND SUBSEQUENTLY IN THE COCKPIT. AN UNEVENTFULL LANDING WAS MADE. THERE WERE NO ABNORMAL INSTRUMENT INDICATIONS DURING THIS OCCURRENCE. MAINTENANCE INVESTIGATION REVEALED THE PORT ALTERNATOR VOLTAGE CONTROL PROTECTION UNIT HAD FAILED. THE UNIT WAS REPLACED AND SYSTEM CHECKS SHOWED NORMAL OPERATION. WIRING HARNESSES WERE INSPECTED AND NO DETERIORATION WAS FOUND. THE A/C WAS RELEASED TO SERVICE.