As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY LIGHTS REMAIN ILLUMINATED WITH EMERGENCY LIGHT SWITCH IN THE ARM POSITION. ACCESS FWD AND AFT EMERGENCY BATTERIES FOR TROUBLESHOOTING. NOTED WITH THE FWD BATTERY CONNECTED AND THE AFT BATTERY DICONNECTED AND THE SWITCH IN THE ARM POSITION THE LIGHTS DID NOT COME ON. THE AFT BATTERY NEEDS REPLACED REMOVED AND REPLACED AFT EMERGENCY BATTERY REF EMB-300 MM 33-52-01/400 OPS CHECKED GOOD.