As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CREW PREFLIGHT 4 FLOOR PROXIMITY EMERGENCY LIGHTS WERE FOUND TO BE INOPERATIVE. MAINTENANCE FOUND AND REPAIRED A BROKEN WIRE FOR THE LIGHTS. OPERATIONAL CHECK WAS GOOD AND AIRCRAFT WAS RETURNED TO SERVICE. 4 BATTERY PACKS WERE ALSO CHANGED DURING TROUBLESHOOTING. (SW21200502057) (K)