As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE POWERING AIRCRAFT OFF, NOTICED FWD CABIN EMERGENCY LIGHTS STAYED ON. VERIFIED FLIGHT ATTENDANT AND FLIGHT DECK EMERGENCY LIGHT SWITCHES WERE IN THE OFF POSITION. REMOVED AND REPLACED POSITION 2 EMERGENCY LIGHT POWER SUPPLY REFERENCE Q400 AMM TASK 33-51-01-000/400-801. EMERGENCY LIGHT SYSTEM OPERATIONAL CHECK GOOD.