i may well be answering my own question here but need to double check.. 
  
my power steering seems rather heavy and with the help of a friend the problem seems to be that the fluid is not moving in the resevoir. 
so with that in mine we believe that i could be either the pump or hopefully the power steering pressure switch,which we believe opens the flow to the rack ? 
the pump still makes all the right noises but the steering is just heavy. 
  
your help on this would be welcome.