Wow Paul, the alarm man reckons you need a new panel, Umm did he get his multimeter out, fitting a new panel will probably not resolve the problem, Its and this is only a guess, the outside bell box tamper, The Scantronic 9448 is a tried and tested alarm panel, and there are lots of them all over the UK. I think the engineer who called at your house needs to go back to burglar alarm school and learn to use a meter. Circuit board lose and you need a new panel, umm what a Plonker he is.
Regards
Nick 07842 480037
Nick, December 2009