What was found
ON PREFLIGHT, CREW REPORTED AVIONICS MASTER SWITCH, INOPERATIVE. MAINTENANCE REMOVED AND REPLACED THE SWITCH AND RETURNED THE AIRCRAFT TO SERVICE.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
ON PREFLIGHT, CREW REPORTED AVIONICS MASTER SWITCH, INOPERATIVE. MAINTENANCE REMOVED AND REPLACED THE SWITCH AND RETURNED THE AIRCRAFT TO SERVICE.