Power steering pump ?

Hi guys look has any one had this problem .When i take my car for a good run say couple of hours,I start to hear whinning coming from power steering, is this a bearing that i can just replace or will it be that Ill have to replace the power steer all together cheers Fish

 

might have a leak like me... but i got that whining all the way home..

 

Hi dont have any leaks just the whining thought i had it fixed , but it came back again and to replace pump your looking new $638 from nissan, will check out 2nd hand one, and get a price cheers fish