As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RETURNED TO DEPARTURE DUR TO MULTIPLE EICAS ISSUES. EMERGENCY DECLARED AND LANDED OVERWEIGHT. MAINTENANCE RAN SEVERAL TESTS AND DID NOT FIND AN ISSUE. AIRCRAFT WAS CLEARED FOR SERVICE. THE NR 1 FMGC FAILED DURING CRUISE. TROUBLESHOT AND FOUND THE NR 1 FMGC FAULTY. REPLACED THE COMPUTER & OPS NORMAL IAW AMM. AIRCRAFT WAS GROUNDED.