What was found
DURING MAINTENANCE INSPECTION FOUND THE INVERTER NR 6 INOPERABLE AND THE NR 4 BATTERY CHARGER HAD A BLOWN INTERNAL FUSE. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE INVERTER--DID NOT FIX. REMOVED AND REPLACED THE BATTERY HOLDER ASSEMBLY---DID NOT FIX. REMOVED AND REPLACED THE NR 4 BATTERY CHARGER AND INSTALLED THE OVERHEAD PANEL AT BATTERY CHARGER NR 4 IN ACCORDANCE WITH EMB 145 AMM 25-22-04. THE AIRCRAFT WAS RETURNED TO SERVICE.