Oh and for anyone with other Check XXX codes you can look at your 15/20p programming manual on page 2 for the TABLE OF DEVICE ADDRESSES it even shows what programming section would effect each device.
So for example if expander emulation was on and the panel had an expander at that address it my show a Check 107 error for the first expander.
Re
Sean M
http://site.aesecurity.com/Manuals/v15pand20pprogrammingguide.pdf