As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 978 FLL-BOS, AIR RETURN TO FLL DUE TO AUTO PILOT, AUTO THROTTLE FAILED IN FLIGHT. AUTO THROTTLE AURAL WARNING ON CONTINUOUSLY. TROUBLESHOOTING PER FAULT CODE 22110029PB1 FIM 22-11-00-810-82M. REMOVED AND REPLACED AIOPB1 IN MAU 1 MOD 9/10. GROUND OPS CHECK OK.