As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 2 ARCDU SHOWED FAILED IN THE "INT" PORTION OF THE ARCDU SCREEN - NR 2 ARCDU CORRECTED THE FAIL MESSAGE WHEN CAPTAIN CALLED FA ON NR 1 ARCDU. NOTE - NO CALLS TO THE FA'S WHERE OCCURRING WHEN NR 2 ARCDU FAILED. DIVERTED. LANDING UNEVENTFUL. REMOVED FROM SERVICE. REMOVED AND REPLACED THE RCAU. OP CHECKS GOOD. OK FOR SERVICE. AIRCRAFT RETURNED TO SERVICE.