As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RTFL DUE TO A ELECTRICAL BUSS FAULT. FOUND CONNECTOR 1PU2A COMPLETELY DISCONNECTED FROM TR2 UNIT. INSPECTED TR2 LOCKS FOR CONNECTOR 1PU2A AND CONNECTOR 1PU2A. NO DISCREPANCIES. RESECURED CONNECTOR TO TR2 AND PERFORMED DC MAIN GENERATION (TR) ADJ AND TEST- RAN ENGINES AND TRANSFERRED POWER BETWEEN APU AND ENGINES. NO PROBLEMS NOTED AFTER TEST.