What was found
DURING CLIMB, THE LEFT ENGINE ELECTRIC GENERATOR OFF LIGHT ILLUMINATED. FOLLOWED QRH PROCEDURES AND TRIED TO TURN ON THE APU, BUT APU DID NOT TURN ON. EMERGENCY DECLARED, RETURNED BACK TO DEPARTURE, UNEVENTFUL LANDING. AIRCRAFT WAS GROUNDED. MAINTENANCE REPLACED THE LT IDG IAW AMM 24-11-01, AND PERFORMED A SATISFACTORY OPS CHECK. MAINTENANCE ALSO REPLACED THE RELAY IAW FIM 49-10-00, AND PERFORMED A SATISFACTORY OPS CHECK.