As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENG 1 OVERSPEED ON CAD. PULLING THE BREAKER MADE IT GO AWAY, PUTTING THE BREAKER BACK IN MADE IT COME BACK ON. WHEN GOING TO IDLE AND BACK TO FLIGHT IT GOES AWAY, COMES BACK ON AT A HOVER. DURING TROUBLESHOOTING, FOUND #1 ENGINE OVERSPEED SENSOR BAD, READS OUT OF TOLERANCE ON PINS 2-3. REMOVED AND REPLACED #1 ENG OVERSPEED SENSOR.