As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN DOOR OPEN CAS MESSAGE DISPLAYED AND CLEARED SEVERAL TIMES. CREW COULD HEAR AN AUDIBLE CLICKING NOISE THAT COUNTINED TO REPEAT. QRH ON GROUND PROCEDURE COMPLETED WITH NO CHANGE. PERFORMED TROUBLESHOOTING OF THE CABIN DOOR OPEN CAS MESSAGE. FOUND THE NC105 PCB TO BE FAULTY. REMOVED AND REPLACED THE NC105 PCB AND PERFORMED OPERATIONAL CHECK. NO FURTHER DEFECTS NOTED AT THIS TIME. REFERENCE AMM 24-60-40.