1999 Acura TL

Steering problem
1999 Acura TL 6 cyl Front Wheel Drive Automatic

99 Acura TL 6 cylinder, Auto, front wheel drive
Power Steering Pump Problem

We purchased a rebuilt power steering pump and had the mechanic replace it. We also replaced the alternator. The acura makes the same screeching noise before the change out. The mechanic who replaced the pump said the pump should be broken in and the noise will go away. We are not to happy with this comment and we wonder if he is correct. I am afraid to purchase a new power steering pump because it can run close to $400 plus labor to install it. How do you know if the car is not having rack and pinion problems?
Any suggestions. When you turn the wheels of the car the noise is much stronger.