Whining noise when turning at low speeds

Need a little help here please.
For the past few days, I've been hearing a whining noise coming from the car when turning at low speeds. I checked the power steering fluid which was topped off around late April. I found no evidence of leaks plus the steering wheel is not stiff as I could still make turns with no problem. Back in 2014, the car had its rack and pinion replaced at the local Pep Boys. I also recently had a belt tensioner pulley replaced at the local AAA store in West Chester. And when I went out for lunch one time, I just happened to meet someone from Meineke who told me that based on what I told him and without a visual inspection of the car, he said it sounded like the power steering pump was going bad.

So can someone please help me solve this mystery?