As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING MAINTENANCE VISIT FOUND THAT THE AFT EMERGENCY LIGHTS ARE ON ALL TIME. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE NR 4 EMERGENCY BATTERY AND POWER SUPPLY. ALL CHECKS GOOD PER EMB AMM 33-50-04. THE AIRCRAFT WAS RETURNED TO SERVICE.