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 UPON POWER UP THE TCAS FAILED INITIALIZATION. THE BASE MAINTENANCE TEAM DETERMINED THE TCAS PROCESSOR HAD FAILED. THE TCAS UNIT WAS REMOVED AND A TESTED TCAS UNIT WAS INSTALLED. OPS CHECKS WERE SATISFACTORY AND THE AIRCRAFT WAS RETURNED TO SERVICE.