As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) TAKE OFF CONFIGURATION WARNING, WHEN ADVANCING PL. WAS NOT ABLE TO SOLVE THE PROBLEM AND RETURNED TO RAMP. IT WAS ESTABLISHED THAT IOM (INPUT/OUTPUT MODULE) NR 1 WAS FAULTY AND IT WAS CONSEQUENTLY REPLACED. IOM OUT S/N 131 AND IN S/N 227.