Re the machine,it`s like triggers broom,the main case and tanks etc ,are the only bit`s that are original,another 25 years and it will be time too retire,in my dreams !!
Must have got the pressure relief valve set right now,took a bit of trial and error yesterday,mainly error,as all the wiring is sat right next to the valve,so had to hair dryer it dry,then spray on some wd40,bad design in my honest opinion,going to get some sort of junction box,and put it in there..