As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE MAINTENANCE NOTED THAT WHEN THE AIRCRAFTS MAIN SHIP BATTERY MASTER SWITCH WAS SELECTED ON, THE AVIONICS SYSTEMS ENERGIZED UNCOMMANDED. TROUBLESHOOTING IDENTIFIED BOTH AVIONICS POWER RELAYS FAULTY (KZ001 AND KZ002). REMOVED THE RELAYS AND REPLACED WITH NEW UNITS. OPERATIONAL CHECKS WERE SATISFACTORY.