As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING MAINTENANCE INSPECTION FOUND THE EMERGENCY LIGHTS INOPERABLE. THE AIRCRAFT WAS REMOVED FROM SERVICE. DURING TROUBLESHOOTING FOUND BATTERY POWER SUPPLY 1 NOT WORKING. REMOVED AND REPLACED THE BATTTERY POWER SUPPLY 1 IAW EMB 140 AMM 33-50-04. THE OPERATIONAL TEST WAS GOOD AT THIS TIME. THE AIRCRAFT WAS RETURNED TO SERVICE.