As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
#1 ARCDU CONTINUES TO CYCLE ON AND OFF. DIVERTED. REMOVED FROM SERVICE. REMOVED AND REPLACED #1 ARCDU IAW CAT III RTS TC 6238101 ALSO REMOVED #2 ARCDU TO FOM AND REINSTALLED IAW RTS TC 6238101 OPS CKS GOOD AIRCRAFT REMAINS CAT III PLACARD READS CAT III MTX CONTROL NOTIFIED. AIRCRAFT RETURNED TO SERVICE.