As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A FUNCTIONAL TEST OF THE EMERGENCY LIGHT BATTERY PACKS, PACKS 9LN, 11LN, 15LN AND 17LN FAILED. MAINTENANCE REPLACED THOSE 4 EMERGENCY LIGHT BATTERY PACKS IN ACCORDANCE WITH THE MAINTENANCE MANUAL. OPERATIONAL CHECKS WERE GOOD WITH NO FURTHER DEFECTS NOTED.