As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMB OUT, RECEIVED LEFT WING ANTI-ICE DISAGREE. WING ANTI-ICE WAS CYCLED OFF-ON BUT SAME RESULT. TRIED A SECOND ON-OFF CYCLE AND SAME RESULT. ALSO RECEIVED NR 1 AIR SYSTEM MANIFOLD FAILURE ALERT. DUMPED 9000 POUNDS FUEL AND RETURNED. R & R LEFT WING ANTI-ICE VALVE IAW MM RE F30-11-02-2. ADJ TEST IAW MM REF 30-11-00-5, NO LEAKS NOTED. OPS CKS NML. ACFT OK FOR SERVICE, FINAL CLOSED.