As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOR FLIGHT 2756 THE CREW REPORTED THAT AFTER ENGINE SHUT DOWN THE NR 1 AND NR 2 BATTERY VOLTS DROPPED TO 23.5 IN APPROX 10 SECONDS. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE NR 1 MAIN BATTERY IAW W/C 24-600-00 AND THE NR 2 BATTERY IAW W/C 24-600-00. THE OPERATIONAL CHECK WAS GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.