power steering fluid leak on 2001 BMW 740i

i have a power steering fluid leak, after i refill it leaks out within 24 hrs, what should i check 1st to repair problem

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2 answers 1 comment
It's the high pressure hose you can change it yourself make sure you buy from the dealer or you will be sorry. it;s about 320.00
I have a 540i with similar issues; could i get the requied hose say from a reputable salvage yard off the same make model and be pretty safe.
Very first thing to do is locate where the fluid is leaking out, then determine what needs to be done to fix it. If the fluid leaks out that fast there should be an obvious signs of leakage.