As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FADEC FAILURE LIGHT ILLUMINATED IN DEPARTURE TRANSITION. PILOT SWITCHED TO MANUAL MODE AND LANDED AIRCRAFT. AIRCRAFT BEGAN ENGINE OVERSPEED, SYSTEM BACK-UPS CUT IN AND SHUT DOWN ENGINE. SYSTEM TROUBLESHOOTING FAILED TO RETRIEVE FLASH CODES. ENTRY TO ECU BY LAP TOP LINK FAILED, NO ECU AVAILABLE. ALLISON REPORT ENGINE REMOVED FOR OVERSPEED OVERHAUL. CYCLES, 18. (X)