As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU BATTERY WIRE W2449-1001-2-0, DAMAGED AT DM24012A. BATTERY CONNECTOR BURNED. INSULATED AND TIED BACK BURNED WIRE. ALSO REMOVED CONNECTOR ON BATTERY. COVERED EXPOSED WIRES AND TERMINALS ON BATTERY. EVERYTHING TIED BACK. IAW GMM20-10-11.