As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 2228 FLIGHT ATTENDANT REPORTED EMERGENCY LIGHTS ON CONTINUOUSLY DURING START UP WHILE POWER LEVERS IN DISC AND CONDITION LEVERS IN FEATHER. EMERGENCY LIGHTS EXITING WHEN PROPS BROUGHT OUT OF FEATHER. REMOVED AND REPLACED NR 1 DC GCU. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.