As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY LIGHTS TURN ON AND THEN IMMEDIATELY FADE OUT THROUGHOUT THE AIRCRAFT. EMERGENCY LIGHT SWITCH IN COCKPIT FOUND IN OFF POSITION. F/A EMERGENCY LIGHT SWITCH FOUND IN OFF POSITION. R & R ALL THE EPSU BATTERY PACK, IAW CRJ 900 AMM 35-51-17 AND OPERATIONS CHECK IS GOOD AT THIS TIME. A/C OK FOR SERVICE.