As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING CRUISE 40 MINUTES AFTER LIFTOFF THE AIR DATA MODULE FAILED. AFTER DISCUSSIONS WITH MTCE THE CREW ELECTED TO RETURN. AN OVERWEIGHT LANDING WAS CONDUCTED WITHOUT INCIDENT. MTCE IS INVESTIGATING THE FAILURE & THE OVERWEIGHT LANDING. RESOLUTION ADM 19FP1 REPLACED IAW AMM 34-11-17 PB 401.