2005 Escape high-pitched noise problem?

Hi, My 2005 Escape XLT/4WD makes a high-pitched annoying noise when driving between 65-70mph. The noise seems to be coming from the engine area or under the truck. The dealer said this may be normal, but isn't sure.
The dealer replaced rear axle components to try to get rid of the noise or fix any problem. This seemed to get rid of the noise for 2 weeks, but now it's recurring. Anyone else experiencing this type of noise?
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