As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO FLL DUE TO THE FLIGHT CREW REPORTING AN AUTO FLT AP OFF AND AUTO FLT A/THR OFF ECAM MESSAGE AROUND 600FT NAV WENT TO HDG AROUND 400. THE AIRCRAFT LANDED SAFELY AT FLL WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED THE FLIGHT CONTROL UNIT 2CA PER AMM 22-81-12 AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK.