As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 2 ARCDU WOULD INTERMITTENTLY GO DARK. WHEN CYCLED OFF THEN BACK ON, IT WOULD INDICATE NORMAL FOR A WHILE THEN GO DARK AGAIN. ARCDU FAIL MSG CAME UP ONCE THEN WENT DARK. RETURNED TO FIELD. LANDING UNEVENTFUL. REMOVED AND INSTALLED NR 2 ARCDU WITH SERVICEABLE UNIT IAW MAINTENANCE 6238101, OPS CHECKS GOOD. C/W LLM RTS IAW MAINTENANCE 6238101, PASSED SATISFACTORILY. ACFT REMAINS CAT III QUALIFIED. RETURNED TO SERVICE.