As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MUC FLT 707 - MUC TO PHL. AFTER TAKEOFF, ALL AUTOPILOT SYSTEMS WERE INOPERATIVE. AFTER SEVERAL ATTEMPTS TO RESET, THE FLIGHT RETURNED TO MUC WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED THE CENTER FLIGHT CONTROL COMPUTER. OPERATIONALLY CHECKS OK.