Hi. I’m having issues with my home alarm. It’s a Euro sec PR5648, I may have part set the downstairs without knowing as the alarm only triggers once I go upstairs, the lights on 2 of the 3 sensors downstairs are flashing but 1 is not, I changed the battery with no joy so I’m assuming I’ve part set it. The other issue is I would like to remove the 10yr old engineer code as I keep getting alerts to service with them on setting the alarm as I change the battery’s myself etc so would rather remove their codes as the factory setting codes do not work. Please help if you can. Thank you.