screeching noise after power steering flush

[kashmir]

I had a PS line leak. Had an Indie replace the leaking lines and replace the PS fluid...( not sure if he did the complete flush). I also had some front suspension work done on the same day. Soon thereafter, I started hearing very loud screeching noise when I cut all the way to the extreme on either side. It happens whether I am driving or not. Took it back to Indie , he said it was the PS pump or fluid related issue. I had ordered fluid from ECS Tuning. he , however, put dextron III as the cap reads "ATF" which i believe was right choice.

do I need to put a different fluid or is my PS pump failing?

thanks as always!
2005 x5 4.4 82 k miles; 2k miles on new motor