Pas Fluid

Sorry to bring this subject up again, it seems quite a popular thing for the mk 2 focus. I have a mk 2 focus, and while pas leaks are not unheard of, I was wondering if ford did a modified setup for the mk 2.5 i.e from 08 until 11 plate - particularly at the high pressure seal where the hosing meets the pump?

The reason I'm asking is I was getting creeking steering which u may of seen in another post and I checked the pas level and I wasn't happy with it. It had fluid in the reservoir, but just below minimum when COLD. I think I almost saw the collection pipe - or pick -up pipe ( don't know its proper name) so I immediately filled it up, it took only about 50mls. After reading about creaking steering, I realise that isn't a symptomatic for low fluid but probably a bush or upper strut etc. I believe since I've had the car (3 years) the fluids always been that level. After filling up with pas fluid I've been monitoring the fluid and NO change in level. But underneath pump seems to be metal which looks stained with some sort of oil (not water) I wonder if this could be spilt engine oil? So did the mk 2.5 (11) plate get a revised unit? Any help would be appreciated. Thanks guys and gals. Jamie.