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 THE TCAS SYSTEM FAILED PREFLIGHT CHECKS. OPERATIONS WERE CONTINUED PER MEL 34-45-02 CAT C. AT CORRECTIVE ACTION THE MAINTENANCE TEAM REMOVED AND REPLACED THE TCAS PROCESSOR WITH REPAIRED UNIT. OPS CHECKS WERE SATISFACTORY AND THE AIRCRAFT WAS RETURNED TO SERVICE