What was found
ON 4/10/26, N975LV CYO975 WAS EXPERIENCING RNAV ISSUES. THE MAINTENANCE FACILITY IN KFXE REPORTED THE FLIGHT CONTROL COMPUTERS WERE CAUSING THE RNAV ISSUES. BOTH FCCS WERE REPLACED AND AN AUTO PILOT FUNCTIONAL CHECK WAS COMPLETED WITH NO ISSUES REPORTED - ALL FUNCTIONS WERE NORMAL. THE AIRCRAFT MADE TWO TRIPS WITH NO ISSUES. ON 4/12/26, THE AIRCRAFT DEPARTED KBOS HEADING TO KMDT WHEN THE AUTO PILOT DISENGAGED AND WOULD NOT RESET. THE CAPTAIN ELECTED TOO DIVERT INTO KTEB. LOCAL MAINTENANCE WAS CALLED AND AUTO PILOT FUNCTIONAL CHECKS AND RINGING WIRING OF THE ENGAGE CIRCUITS PERFORMED. NO DISCREPANCIES COULD BE DUPLICATED. ALL AUTO PILOT SYSTEM CHECKS WERE FOUND TO BE NORMAL. THE AIRCRAFT IS CURRENTLY OUT OF SERVICE WAITING FOR CREW AVAILABILITY TO COMPLETE A TEST FLIGHT.