Whining Noise when RPM's go up on 2007 Chevrolet Trailblazer

My truck makes a whinning siund when the RPM's go up. It has been suggested that the power steering fluid may be low...? I've just reache dthe 1000,000 mile mark and did have the oil changed and fluids derviced last week. They said the other fluids were fine, but they also did not reccommend any of the other servicing that your site reccomends for specific mileage marks. Ideas?
Thank you,

Tammy Davis

Stop by your local Napa and ask the counterman if he could listen to your engine as its tough to diagnose sounds over the internet Hope this helps
Parts & Service Inc
2901 Riverside Ave
Paso Robles, CA 93446
1 more answer
it might be your idler pully mine did that and i put a new one on and that fixed the problem