As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAKEOFF, AC LOCKOUT WARNING ILLUMINATED WITH AC BUS OFF. FOLLOWED COM PROCEDURE AND RETURNED TO MSP. FLIGHT LANDED WITHOUT INCIDENT. REPLACED LEFT GENERATOR CONTROL PANEL. RAN BOTH ENGINE, APU AND EXTERNAL POWER AND ALL BUSES OPERATE NORMAL.