What was found
WE RECIEVED AN ENG CNTRL FAULT R CAS MESSAGE DURING CRUISE. RAN THE QRH PROCEDURE BUT MESSAGE DID NOT CLEAR. POWERED UP ACFT VIA APU AND INTERROGATED CMC FOUND 2 FAULT CODES SA & SB. BOTH ISSUES HAPPENED AT CRUISE, CONTINUED. GAINED ACCESS TO DCU CONNECTOR IN BAGGAGE & DOWNLOADED BRC FILE FOR PWC TO REVIEW. RAN ENGINES & UNABLE TO DUPLICATE FAULT AT IDLE. PWC RESPONDED ENGINE WISE YOU CAN SWAP AND REMIRROR EEC'S AND DO SOME OPS CHECKS TO SEE IF THE ISSUE FOLLOWS. IF NOT, THIS RULES OUT THE ENGINE AND YOU WILL NEED TO GET WITH AND POSSIBLE SEND AN ARES DOWNLOAD TO SEE WHAT'S GOING ON WITH THE SYSTEM. RECEIVED SERVICEABLE CANNIBALIZE PART FROM NJA ( DONOR AIRCRAFT N957QS). INSPECTED RH FADEC CHANNEL A1 HARNESS, NO DAMAGE NOTED. REMOVED AND REPLACED RH FADEC CHANNEL A1 HARNESS AS REQUIRED. PERFORMED OPS CHKD, NO DEFECTS NOTED. REF. EMM 73-20-03, AMM 76-15-00. SEE STEPS FOR WORK DETAILS.