What was found
AIRCRAFT WAS GROUNDED: AUTO THROTTLE DID NOT RETARD UPON REACHING SPEED/ALT AT 17000".SPEED SELECT 330 KTS.AIRCRAFT OVERSPEED 10 KTS FOR APPROX 5 SEC.AUTO PILOT DISC, NOSE PITCHED UP.MANUALLY DISCONNECTED AUTOTHRUST,RECOVERED,RECONNECTED AND NEVER REPEATED AGAIN. C/W SUCC. OPERATIONAL TEST OF THE ENGINE/AUTOTHRUST SYS.ISOLATION WITH AIDS PER AMM 22-30-00.C/W SUCC.AFS GD. SCAN PER AMM 22-96-00.C/W SUCC. LAND CAT III CAP. TEST IAW AMM 22-97-00.UNABLE TO DUPLICATE FAULT.