Understood, I'm not going to ... I'll check everything before I do anything. It's why I'm here. I won't be taking it to a 'tech' I'm just not that sort of person, I'm not an expert but I'm pretty handy and with help I can get most jobs done. I won't be replacing the valves unless I need to, I was just checking what they were in case I need to and see if they were commonly available. The all look in pretty good shape to be honest.