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I would start by having the Dealership check the alignment and print out the specs without making any changes. If it's still within specs, you can provide that information to TireRack to get the tires replaced. If it's out of spec, then you need to have it aligned. You can still use the existing tires if the tread is good, you will just have to deal with the noise, or you can get new ones.
Also, check the warranty (if any) on your last alignment.
And tire pressure has nothing to do with the alignment. But if you are manually checking the pressures, then take a little extra time and check the tread and wear as well. Unless it's bad enough to effect handling, your only indication of alignment issues or just tire wear will be from a visual inspection.
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