[projectRDM]

Have you looked to see if anything is hitting the column when you turn? That would be my first guess, since you know it's a possibility. Not like we can see the car.

Next, did they open the power steering system, and if so did they refill it with the correct fluid and bleed it properly? Using the wrong fluid can damage the rack, an air pocket would give the feel of a dead spot in the rack as well.