As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
VTK DISPLAYED ON CAPTAIN'S NAVIGATION DISPLAY WITH LOSS OF FMC DATA ON CAPTAIN'S CDU. MAP WAS NOT DISPLAYED. AFTER 1 MINUTE NORMAL OPERATION ON CAPTAINS NAV DISPLAY AND CDU WAS RESTORED. LOSS OF FMC DATA ONLY ON CAPTAIN'S CDU. GROUNDED - YES. PERFORMED FMCS OPS TEST REF MM 34-61-00, NO DEFECTS NOTED. NO HISTORY 30 DAYS. ACFT OK FOR SERVICE. SEAMC DOUG NOTIFIED.