As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING THE ANNUAL DEEP CYCLE CHECK OF THE EMERGENCY LIGHT BATTERY PACKS THE BATTERY PACK THAT PROVIDES POWER FOR THE EMERGENCY LIGHTS AT DOOR 4R FAILED THE CHECK OUT. MAINTENANCE REPLACED THE BATTERY PACK AND THE SYSTEM PASSED THE CHECK OUT.