Did you employer withhold money for another state besides Tennessee? Your employer should have put the state code in box 15. But if your employer didn't put an amount in box 17 or if your employer didn't withhold for any state at all, then you have no reason to modify your W-2.
And if you employer DID withhold money and send it to another state like PA, then you need a corrected W-2...and you need to confirm with your employer's payroll department that they actually sent the money to that state.
If I understand your situation correctly, it's entirely possible that your TN employer didn't withhold any money for PA, in which case you leave the boxes 15-17 blank (if they are on the W-2).
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