As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING MAINTENANCE INSPECTION FOUND THE NR 1 EMERGENCY LIGHT BATTERY UNABLE TO PROVIDE POWER. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMVOED AND REPLACED THE NR 1 EMERGENCY LIGHT BATTERY IAW AMM 33-50-04. THE OPERATIONAL CHECK WAS GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.