As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE IN CRUISE FLIGHT RETURNING TO BASE, 122 KIAS, 84.6 TQ, THE FADEC FAIL WARNING HORN AND LIGHT CAME ON ALONG WITH NO AUTO-START AND ONE OTHER LIGHT. THE ROTOR DROOPED TO ABOUT 94 BEFORE IDENTIFIED AS A TRUE FADEC FAIL TO MANUAL AND ADJUSTED COLLECTIVE TO MAINTAIN ROTOR RPM. PRESSED FADEC AUTO/MAN BUTTON, CONTINUED TO FLY AND LANDED SAFELY AT ELLINGTON FIELD.