@Alan12 You sound old enough to have learned many life lessons, but unfortunately taking advice from someone with experience isnt one of them.
I dont think anyone here is trying to drum up business. My business mostly deals with commercial and public sector contracts, we do have some domestic but not a great deal. I would not be interested in taking on a 30 year old domestic Scantronic panel contract.
Most here would be the same we all have plenty of work, this is one industry where you may struggle to find someone that will take it on.
It was clear from you first post you are not a DIY installer you inherited the system and decided to try and fix it yourself.
If you were a DIY installer you would have installed it yourself and had the manual already, and you would know what to do. Most DIY installers come here because they dont understand something in the manual or they want clarification on something or they want advice on placement etc.
Alarm systems are made in such a way that they cannot be easily compromised. The side effects of this is that when they are not serviced regulary parts fail. This only becomes apparent when its too late and the alarm is sounding and cannot be stopped. Again most DIYers would understand this as they installed the system and understand how it works and carry out their own service regularly.
Security companies have to run 24 hours and operate an out of hours service because even serviced alarm systems can go wrong. All of us on here get calls every now and again from non contract customers because there alarm is sounding and they cant stop it. My engineers wont attend non contract customers (mainly because non-contract cant afford the call-out charge) but that doesnt stop non-contract calling us and disturbing their sleep, and this is why we give advice on servicing.
I am sorry that you thought that the advice we gave was not good enough. This forum is here to give free advice from engineers and business owners that give up their time free because they are passionate about this industry, not because they need to earn from you