What was found
AT CRUISE ALTITUDE, EXPERIENCED AN ELECTRICAL PROBLEM, AC CROSS-TIE LOCKOUT. LEFT GENERATOR BUSS FAILURE. CREW PERFORMED APPLICABLE COM PROCEDURE TO MITIGATE ELECTRICAL MALFUNCTION. ATC ADVISED THAT THERE NO ALTITUDE READ OUT FROM ACFT AND IN RESPONSE CREW DECLARED AN EMERGENCY TO MITIGATE AN ALTITUDE EXCURSION AND TRAFFIC CONFLICT. CREW RESTORED ELECTRICAL POWER AND NO COMPONENTS, EXCEPT FOR LT GENERATOR AND AC CROSS-TIE LOCKOUT, EFFECTED, WITH ALL BUSSES POWERED. CREW CANCELED EMERGENCY WITH ATC AND CONTINUED TO DESTINATION. ACFT LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE LT ENGINE GENERATOR IAW MM 24-10-1. NR 1 GENERATOR SYSTEM OPERATIONALLY CHECKED GOOD IAW MM 24-20-1. THE DMI WAS CLEARED AND THE ACFT RETURNED-TO-SERVICE.