What was found
FLIGHT 2377. DURING AUTOLAND APPROACH TO 16R AT KSEA, AILERON DEFLECTED TO TO 80 DEGREES TO THE RIGHT NO LOCALIZER FAULT OBSERVED ON APPROACH. AILERONS STAYED UP TO 80 DEGREES RIGHT TO TOUCHDOWN. CONSIDER AUTOLAND UNSUCSESSFUL. REMOVED FROM SERVICE. NO FAULTS ON EICAS. SEARCHED CMC HISTORY FOUND FAULT 22110239PA1. PERFORMED FIM 22-11-00-810-92C-A. CONSIDERED TRANSITORY CONDITION. PERFORMED AUTOPILOT OPS TEST PER AMM 22-11-00-710-802-A, OPS TEST GOOD NO DEFECTS. PERFORMED AUTOPILOT AILERON SERVO OPS TEST PER AMM 22-11-04-710-801-A, OPS TEST GOOD, NO DEFECTS. AIRCRAFT REMAINS CAT III, FLIGHT DECK PLACARD READS CAT III, MAINT CTRL NOTIFIED. RETURNED TO SERVICE. NO PARTS REPLACED.