As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING MAINTENANCE THE APU GENERATOR WIRE WAS FOUND BURNED UNDER THE CARGO FLOOR. THE WIRE WAS BURNED AT THE MANUFACTURE SPLICE WHERE THE WIRE CHANGES FROM COPPER TO ALUMINUM. MAINTENANCE REPLACED THE WIRE WHICH RUNS FROM LEFT POWER CONTROL BOX IN THE COCKPIT TO THE APU GENERATOR. OPERATIONAL CHECKS WERE GOOD.