Help! 9751 cooper alarm

Joined
11 Aug 2013
Messages
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Location
Cumbria
Country
United Kingdom
So I had the engineer code, which was 4 digits then 0, on my 9751 alarm and I changed the settings on the alarm so the user code was 6 digits as oppose to 4. But now the engineer code does not work. Any ideas as to what the engineer code would have changed too?
 
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