How to appeal a DCF child abuse finding in Boston?

About 3 years ago my ex charged me with child abuse of our son. I didn’t do anything wrong, I grabbed his arm to keep him away from the stove and it left a mark. He told his mother I ‘hurt’ him and that started the whole process of a Department of Children and Families Investigation. At the end, they told me they didn’t have enough evidence to rule the abuse charge in or out. I knew I didn’t abuse my son so I took no further action. I recently applied for a job as a bus driver and was required to submit to a background check. They are telling me the child abuse charge is showing up on my record and that disqualifies me from certain jobs around children. What can I do to appeal the abuse finding or otherwise get it off my record?