TurboTax does not get any updates or information from the IRS after you file your tax return, so TT will have no information about why the IRS reduced your refund. The IRS will be sending you a letter to explain why they reduced it. It usually takes several weeks for the letter to arrive.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**