What was found
CUSTOMER REPORTED THAT THE CREW ALERTING SYSTEM (CAS) MESSAGE ECU1FAIL ILLUMINATES ON THE RELATED DISPLAY AND THAT THE ENGINE CONTROL (ECU) REVERTS THE ENGINE FROM ECU CONTROL TO THE MANUAL MODE OF CONTROL. AFTER EXTENSIVE TROUBLE SHOOTING AND RECOMMENDATIONS FROM PRODUCT SUPPORT AND ENGINEERING THE PROBLEM WAS RESOLVED BY REPLACING THE FOLLOWING RELATED WIRING AND COMPONENTS. R & R RELAY BASES FOR RELAYS K319 AND K321 WITH PN SO-1064-001. R & R ASSOCIATED WIRE NUMBERS 109,105,112,114,116,118,111,106 AND 110.