As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT CREW REPORTED DU 1+2+3+4 WENT DARK FOR 1 SEC. MAU WENT THROUGH FULL REBOOT. NAV DATA LOSS AND HAD TO REINITIALIZE. THE MAU CHASSIS WAS FOUND TO BE FAULTY. IT WAS REMOVED AND REPLACED IAW AMM 12-B-31-41-00-00A-920A-A, UPLOADED FILES IAW AMM 12-B-45-45-00-00A-550A-A. PERFORMED AN OPERATIONAL TEST OF THE MAU IAW AMM 12-B-31-41-00-00A-903A-A. NO FURTHER FAULTS WERE NOTED. P/N VOFF/ON: 7029782-1912 S/N OFF: 11095590 S/N ON: 08062579.