How to check "Proposed Tax Due"

Hello. After I file a state Tax in Michigan, I received a letter C-4364 from Michigan notifying me that adjustments have been made to my return.  Based on the adjustment(s), I owe additional tax.  It say "your unexplained subtraction on your Michigan Schedule 1 was disallowed."

 

Before I pay the proposed tax due, I would like to have a professional to take a look at. Where can I professional help to get this resolved?

 

Your advice is much appreciated.