As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FLIGHT CREW REPORTED THAT PRIOR TO TAXI THE 3 LEFT DISPLAY SCREENS ALL DISPLAYED RED X. THE MAINTENANCE TEAM DETERMINE THE IC-600 CARD WAS DEFECTIVE. THE CARD WAS REMOVED AND REPLACED WITH A REPAIRED CARD. OPS CHECKS WERE SATISFACTORY AND THE AIRCRAFT WAS RETURNED TO SERVICE.