As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLT - DURING WEEKLY CHECK, WHILE PERFORMING EPSU TEST, MAINTENANCE FOUND THE BATTERY AND BATTERY CHARGER UNITS AT FIN WL11 BURNED, CAUSING EPSU TEST TO FAIL. MAINTENANCE REMOVED AND REPLACED THE CHARGER AND BATTERY AT WL 11. OPERATIONAL CHECK GOOD PER MM 33-51-38.