As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING OVERNIGHT LINE CHECK, FOUND EMERGENCY FLOOR LIGHTS FROM SEAT 64C TO DOOR 4 LEFT STARTED DIMMING. MAINTENANCE FOUND SHORTED WIRES. MAINTENANCE REPAIRED SHORTED WIRES AND REMOVED AND REPLACED BATTERY PACK. OPERATIONAL CHECKED GOOD AND AIRCRAFT RETURNED TO SERVICE.