Hi folks regarding alarm ecu faults with post 2007 defenders,
these 10as modules have been causing a lot of problems i have changed a lot of these for immobiliser faults, on mine i have switched off passive immobiliser and fitted an aftermarket immobiliser and informed insurance i have fitted it,
from experience a lot of the probs ive seen with bump related issues
ie hazards and door locks unlocking have been caused by loose 10as unit ( one screw is a bit awkward and is often loose or left out by lazy techs when replacing ecu ) pop out rh speaker you can access lh screw with a t20 torx and long extension past through rhs of column.
worth a check, hope this helps, modules are crap iam looking into bypassing altogether.