As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN EMERG LT IS ON-C/A-UPON THROUBLESHOOTING FOUND BATTERY POWER SUPPLY INOP, REMOVED AND REPLACED BATTERY POWER SUPPLY AND FOR PRECAUTIONARY PURPOSE RAR BATTERY PACK #4 IAW EMB 140 AMM 33-50-04. OPC GOOD NO DEFECTS NOTED AT THIS TIME. EMERGENCY LIGHTING BATTERY P/N 2013-1A S/N 105997