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 LIGHTING FOR THE CATWALK IN THE TAIL COMPARTMENT WAS INOPERATIVE. MAINTENANCE FOUND WIRES TO BE CORRODED AT TERMINAL NR 5. THE CORROSION WAS CLEANED AND THE SYSTEM RETURNED TO NORMAL.