As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT RETURNED TO DEPARTURE, DUE TO A GENERATOR FAIL INDICATION. EMERGENCY DECLARED AND AIRCRAFT LANDED WITHOUT INCIDENT. AIRCRAFT WAS GROUNDED. REPLACED THE LEFT ENGINE CONSTANT SPEED DRIVE, LEAK AND OPS CHECKED GOOD IAW AMM 24-10-01.