I received an IRS notice noting that the 2019 tax withheld reported from my employer is different than the 2019 tax withheld reported on my tax return. Need CPA!

I have been using TurboTax for decades.  I always import my W2.  For the life of me, I can't figure out what went wrong.  I attempted to amend my 2019 tax return here in TurboTax but I'm afraid to mail it.  I'd like for a CPA to review to make sure I'm doing the right thing.  I'm in Phoenix, Arizona if I can't find this support here on line in TurbTax.  Dan Hildebrand