What was found
CREW REPORTED EICAS MSG FOR RUDDER RATIO, AILERON LOCKOUT, AND AUTOPILOT PROBLEMS. RETURNED TO SFO. AILERON LOCKOUT MESSAGE WAS GENERATED BY FAULTED STAB TRIM AILERON LOCKOUT MODULE (SAM). NOTE, SAM ALSO PROVIDES AIR DATA TO RUDDER RATIO CHANGER MODULE. REPLACED SAM PER APPLICABLE MAINTENANCE MANUAL. OPS CHECKED AILERON LOCKOUT SYSTEM, RUDDER RATIO CHANGER, AND AUTO PILOT SYSTEM PER APPLICABLE MAINTENANCE MANUALS. ALL OPS CHECKS WERE NORMAL.