As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING MAINTENANCE BASE INSPECTION, FOUND THE NR 3 AND NR 4 EMERGENCY POWER SUPPLIES TO BE WEAK. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE NR 3 AND NR 4 EMERGENCY BATTERIES AND CHARGERS IAW CRJ 700 AMM 33-51-17. THE OPERATIONAL CHECK WAS GOOD. THE AIRCRAFT WAS RETUREND TO SERVICE.