Another example why diagnosing the problem before throwing parts at it is important.

Also another example that guys should invest in a mechanic's stethoscope. The screwdriver trick works, but I like the stethoscope better. I had a pulley noise I had to deal with not too long ago and I was quickly able to diagnose it was the alternator pulley bearing with my stethoscope. This is a tool every DIY Mechanic should own.

Here's the one I own:
Amazon.com

For the record, my mechanic had said he thought the whine was coming from the PS pump after I got some other work done on it so that's why I focused on it.

I was also trying to go from the cheapest fix to the most expensive fix.
Looking back, I would not have spent my time and effort flushing and then rebuilding my old PS pump - I would have flushed and put a remanufactured pump on in one swoop. Tim's great video of flushing and cleaning the screens solved his problem so I thought I would see if I could get out that easily (and cheap) also.

Even though it wasn't the problem, replacing my old one with the remanufactured one (and a flush) did result in better handling as it seems the steering is more responsive. IMHO.

But I understand if someone wants to rebuild their own. That's their choice.

So that's why I posted, so others could learn from my mistake(s).....and my mechanic's original misdiagnosis.

Sounds like your "Mechanic" should invest in a mechanic's stethoscope as well.