As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING PRE-FLIGHT INSPECTION, CREW FOUND AFT SECTION OF EMERGENCY FLOOR PATH LIGHTING WOULD ONLY STAY ILLUMINATED FOR 15 SECONDS. MAINTENANCE INSTRUCTED PILOT TO RUN THE APU AND POSITION EMERGENCY LIGHTING SWITCH TO THE ARM POSITION. IN 10 MINUTES, THE BATTERY PACK RECHARGED, SYSTEM OPERATED NORMALL. AIRCRAFT WAS RETURNED TO SERVICE. (M)