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How can I fix Scantronic 9448+ Tamper led?

Recently my alarm has been giving problems when setting and unsetting
Example today, enter code, nothing happens - repeat a few times . Tamper shows and alarm sounds. Takes a few attempts to stop alarm.
Example 2 - unsetting alarm. Code does not work, try a few times and again alarm sounds and tamper led shows
Tony LD, May 2015
link Click here to see other fixes for Scantronic 9448.