My employer has asked for a written response regarding an arrest when I was 15 year old. I am required to provide one?

I have been having ongoing problems with my employer. I filed a EEO compliant against them. Shortly, after I returned to the office someone from HR told be that my FBI Clearance had an arrest in 1983. I was 15 years old then. I am now 41 years old. I thought that record was sealed and confidential.