Here is the user manual for you: http://www.securtek.com/products-services/system-user-guides/ge/GE%20SimonXT%20User%20Manual.pdf . Answers are found on pg 31-32. Go to Section heading entitled "Access codes" (shown in blue). It then walks you through changing the Master Code, User Codes 1 to 8, and the Duress code. Not sure which code you are looking for but the steps for each code are pretty simple. Hope this helps.
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