As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOR FLIGHT 3923 MAINTENANCE FOUND THE EMERGENCY LIGHTS TO BE INOPERABLE. THE BATTERIES WERE DEAD. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED ALL 4 EMERGENCY LIGHT BATTERIES IAW EMB-140 AMM 33-50-04. THE OPERATIONAL CHECK WAS GOOD. BATTERY PACK PART NUMBERS ARE ALL 2013-1A. SERIAL NUMBERS ARE AS FOLLOWS NR 1: 68824 / NR 2: 69067 / NR 3: 104953 / NR 4: 101799. THE AIRCRAFT WAS RETURNED TO SERVICE.