What was found
ENROUTE TO CLE, LEFT ENGINE OUTLET AND RISE WENT TO FULL SCALE HIGH. DISCONNECTED THE CONSTANT SPEED DRIVE. NR 1 GENERATOR FAILURE AND APU WOULD NOT START. EMERGENCY WAS DECLARED, FLIGHT DIVERTED AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED CENTRIFUGAL SWITCH ON APU AND PERFORMED SATISFACTORY OPERATIONAL CHECK IAW AMM 49-60-01. REPLACED CONSTANT SPEED DRIVE, OIL COOLER, AND GENERATOR IAW AMM 24-10-01, 24-10-03, AND PERFORMED SATISFACTORY OPERATIONAL CHECK. AIRCRAFT WAS GROUNDED.