As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOS/SYR - FLT 4705 - AFTER TAKEOFF, CREW NOTED THE LEFT AC GENERATOR HAD FAILED AND WOULD NOT RESET. THE AIRCRAFT DIVERTED BACK TO BOS AND THE AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE LEFT AC GENERATOR AND GENERATOR CONTROL UNIT AND PERFORMED ALL OPERATIONAL CHECKS, AIRCRAFT WAS THEN RETURNED TO SERVICE. (X)