As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INTERMITTENT MASTER CAUTION CHIME LIGHT. INTERMITTENT BLINKING OF FEATURES DISPLAYED ON CAPTAINS PRIMARY FLIGHT DISPLAY AND NAVIGATION DISPLAY. FLIGHT CONTROL UNIT LIGHTS FLASHING ALSO. THE FCU WAS REPLACED AND GROUND CHECK WAS NORMAL.