As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING INSPECTION THE LAST TWO ROWS OF EMERGENCY FLOOR LIGHT STRIPS WERE INOPERATIVE. MAINTENANCE FOUND MULTIPLE FUSES IN BATTERY NR 4 BLOWN AND INVERTER NR 6 PRODUCING A HIGH PITCHED WHINE. THE NR 4 BATTERY PACK AND NR 6 INVERTER WERE REPLACED WITH NO FURTHER DEFECTS NOTED. BATTERY NR 4: P/N: 100865, S/N: C01798, TSN: 13293, CSN: 10906, TSR: 1926.