In the past several days, I have been having a problem with the steering becoming very hard/stiff when making turns. So I had Subaru service department flush and replace the power steering fluid in my 05 STI. (they also checked for leaks, but didn't find any). The steering is much better now, but still seems stiff compared to how it used to be. Any ideas or thoughts of what it could be? It has been about two days since the steering fluid was flushed out.