recently put a new actuator on my 2wd saff coz the old one was shagged but its not holding boost very well.The car was set up to hold22/23psi but at the moment its peaking at 24 and holding about 17,so its way down on boost.Why is it not holding boost......to get it to hold22 psi i have to set it to peak at about 28psi which is too high.So ive backed it off til i get it sorted.Could the amal valve be knackered or something else.Ive checked all hoses and there are no leaks at all.