As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING CLIMB, IT WAS OBSERVED THAT THE NR1 AND NR2 EMUX SINGLE CHANNELS FAILED. THE AIRCRAFT RETURNED TO BASE AND LANDED WITHOUT INCIDENT. THE NR1 AND NR2 MAIN FLIGHT DISPLAY UNITS WERE REPLACED AND CHECKED SERVICEABLE IAW MM 31-61-01. NO FURTHER INCIDENT DURING SUBSEQUENT FLIGHT.