As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING SERVICE CHECK MAINTENANCE FOUND THE CEILING PANEL EMERGENCY LIGHTS WERE INOPERATIVE BETWEEN THE OVER WING EXITS TO THE AFT LAVATORIES. THE BATTERY PACK B5-231 WAS FOUND TO BE BAD AND WAS REPLACED. OPERATIONAL CHECK IS GOOD AND THE AIRCRAFT RETURNED TO SERVICE. (LP #5954816)