As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING LINE CHECK, MAINTENANCE FOUND THAT THE EMERGENCY PATHWAY LIGHTING FOR THE CATWALK IN THE TAIL COMPARTMENT WAS INOPERATIVE. MAINTENANCE REPLACED THE BATTERIES AT B27 POWER UNIT AND AT THE TAIL COMPARTMENT POWER SUPPLY. OPERATIONAL CHECK WAS GOOD AND THE AIRCRAFT RETURNED TO SERVICE.