Black power steering fluid

[Integrale1]

I've noticed for a while now that my phase two 172 has a whine on cold start up and when turning to full lock in either a forwards or reverse gear. Having read some of the replies to similar issues I decided to do some investigating.
I noticed that the power steering fluid is black in colour and smells pretty awful . My question is. Is this a sign my pump is breaking down or could it just be that it hasn't been changed in a while?
If it needs changing what would be the easiest way to get into the system?

Thanks for any help.

 

[dangerous dave]

It should be cherry red, change it first as it sounds shafted.

Should be able to drain it from a hose or if there's a specific drain point...

Fill, lock to lock the steering wheel while running to bleed..

 

[Perry]

Is there a definite way of doing this as I'm reading through various threads and everyone seems to do it differently.