As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EXTERNAL OVERWING EMER LIGHTS INOPERATIVE. TROUBLE SHOT IAW FIM TASK 33-50-00-810-804-A. FOUND NR 4 BATTERY & CHARGER TO BE BAD. R & R NR 4 BATTERY & CHARGER IAW WC 33-700-19. OPERATIONS CHECKED GOOD, NO DEFECTS NOTED AT THIS TIME ENDS. EMER LIGHT BATTERY, PN 2013-1A & SN 108110.