What was found
DURING MAINTENACE VIST FOUND THE EMERGENCY LIGHTS LEFT ON. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE EMERGENCY POWER SUPPLY UNIT BATTERY NR 2, 3 & 4 IAW EMB-145 AMM 33-50-04. SERIAL NUMBERS: 96216, 109815, 85163. THE OPERATIONAL CHECK WAS GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.