As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TYS - DURING A SCHEDULED 4C INSPECTION WHEN THE SERVICE/ROUTINE WAS BEING C/W THE NR 2 EMERGENCY BATTERY WAS FOUND LOW ON CHARGE. MAINTENANCE REMOVED AND REPLACED THE EMERGENCY BATTERY AND OPS CHECK WAS GOOD. A/C WILL BE RELEASED WHEN ALL WORK IS C/W.