Did they find your issue? I believe I may have the same noise. Slight wine, happens entire time while engine is running. Increases with RPMs, doesn't matter if AC is running or not. Ironically, I noticed it immediately after I had my transmission fluid change, which leads me to believe it could be trans pump? Or maybe Oil pump? I had both done on the at the same time. I dropped it off at the dealer but they cant seem to isolate it. Told them I'm not picking it up until its fixed as I am nearing the end of my powertrain warranty. Thanks.