For a few weeks I have had an interminten bearing squeaking sound from a pulley once the car is warmed up. The noise comes and goes as I turn the steering wheel. I replaced all the idler and tensioner pulleys on advice from a mechanic buddy. It sounds like morse code and only comes on at slow speeds while turning. Once I finish turning the noise will start and I could be driving straight, but until i turn again the noise will not go away. Do Ineed to replace the power steering pump?