As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED THAT EMERGENCY LIGHTS, WHEN POWER IS OFF, GOES OUT OR TURNS OFF IN A FEW SECONDS. THE ACFT WAS REMOVED FROM SERVICE. REPLACED EMERGENCY BATTERY PACK 43WL IAW 33-51-21-RAI-10010. THE OPS CHECK WAS GOOD. THE ACFT WAS RETURNED TO SERVICE.