As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING APU FUEL VALVE POSITION INDICATION TEST. FUEL VALVE TRIPS THE CIRCUIT BREAKER AND DOES NOT RESET. TROUBLESHOT IAW WDM 28-25-21, FOUND A SHORT AT CONNECTOR D1564, PIN 2. REMOVED & REPLACED THE WIRES W484-302B/R/Y FROM D1564 TO D5700P IAW WDM 28-25-21. PERFORMED AN OPS CHECK IAW AMM 49-11-00. CHECKED NORMAL.