What was found
UPON ARRIVAL, CREW REPORTED ACW GENERATION FAULT EN ROUTE FROM FSD TO RAP. ACW GENERATOR COULD NOT BE RESET. MAINTENANCE TROUBLESHOT DISCREPANCY AND DISCOVERED CHAFING OF THE ACW WIRE HARNESS RESULTING IN ARCING AGAINST THE ENGINE BOSS FOR THE ENGINE NH SENSOR. THE ARCING ERODED THE METAL OF THE ENGINE BOSS. DAMAGE REQUIRES THE REMOVAL AND REPLACEMENT OF THE ENGINE. THE ENGINE AND SENSOR WERE EVALUATED. THE ACW WIRING BUNDLE HAS BEEN REPLACED. AIRCRAFT WAS EVALUATED TO DETERMINE IT WAS SAFE FOR FERRY FLIGHT. AIRCRAFT FERRIED TO GEG WHERE ENGINE WILL BE REPLACED.