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Hi. First time posting and I have two questions I would like to ask First off, I need to replace a PIR in our home and would like to carry out the replacement myself. The problem is that I don't know exactly what alarm system I have (its at least 20yrs old) and would appreciate any help to identify it. I believe its a 800L as the circuit board layout looks exactly the same. I've attached a picture of my current board and would really appreciate it if someone could confirm if I'm correct. What I'm also not sure about is the function of the transformer in the bottom left and th