Thanks. I know all that having worked in the industry for many years but I have never come across the message quoted in my first post.
That is what I need an answer to, not if 10 years is good value for money.
It probably is but I don't want to tell my neighbour he needs a new system if an EEProm reset is all that is required or a replacement EEProm.
I need to know if the last two points are realistic or possible.
Thanks Phil