As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOSS OF ALL NAVIGATION AND PERFORMANCE DATA ALONG WITH VTK FLAG BOTH SIDES DURING CRUISE. FLAGS DISAPPEARED AFTER 1 MINUTE AND WE WERE ABLE TO ENTER ALL DATA WITH NORMAL FUNCTION. ACFT GROUNDED. ACCOMPLISHED FIM 34-61, TASK 801. NO CURRENT FAULTS NOTED. NO HISTORY 30 DAYS.