Initially it was overnight but now if the car is parked up for an hour it drops

The ride is soft at the front (the rear has always been stiff) so I'm starting to think that one of the front spheres has punctured.
I had been thinking for a while to go to westroen and get the rear end spheres done but now I'm thinking of taking an afternoon and getting the whole lot done unless I have a really bad strut leakage which I'm guessing I can only tell by taking off return pipes

Along these lines does anyone have or know of a diagram showing which return hose is which when they get to the lhm tank?