As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF MULTIPLE CB INDICATIONS APPEARED ON THE ECAM, THAT CAUSED POSSIBLE UNSAFE CONDITIONS WITH FIRE DETECTION EQUIPMENT. THE ACFT RETURNED & LANDED WITH NO INCIDENTS. REPLACED THE CB MONITORING UNIT & ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK IAW AMM 24-53-34-000-801-A.