As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING SCHEDULED RON WHILE TROUBLESHOOTING APU INOP, FOUND APU START CONVERTER CONNECTOR D11114B BUNRNED. MX FERRIED ACFT TO DALLAS FOR REPAIR AND FOUND APU STARTER CONVERTER BOX CENTER MALE END CONNECTOR PARTIALLY BURNED, FEMALE CONNECTOR AT RACK ASSY TOTALLY BURNED WITH PIECES OF INSULATION MATERIAL MISSING AROUND PINS, AND WIRING MELTED BEHIND CONNECTOR. REMOVED AND REPLACED APU STARTER CONVERTER BOX AND RACK ASSY WITH WIRING HARNESS.