As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED THE NR 1 AVIONICS SWITCH WAS STUCK AND THE NR 2 AVIONICS SWITCH WAS ALSO REPORTED INOPERATIVE WHEN PLACED IN THE ON POSITION. ON INSPECTION, FOUND THAT BOTH AVIONICS SWITCHES HAD FAILED. IT WAS ALSO LATER DETERMINED THAT THE 2 SWITCHES WERE WIRED INCORRECTLY WHEN REFERENCED TO THE WIRING DIAGRAM. THE WIRING WAS CONFIGURED SO THAT IF THE NR 2 SWITCH FAILED THE NR 2 BUSS COULD NOT BE ENERGIZED USING THE AVIONICS BUSS TIE SWITCH.