Very old debt

Hi, we recently started the process of refinancing our mortgage because interest rates are so low. While looking over the loan application I saw a debt on there from Chase Bank for $15000. We are not paying anything currently to Chase Bank. I called the loan officer and he said that it is showing "closed" but is still on my report. From 1986-1991 my future husband and I had a number of credit cards and a car loan that we could not pay because of illness. The car was reposessed. These loans were "charged off" I believe the term is because we couldn't pay. I think one of these may have been Chase but I can't remember. Also sometime around 2004 or so I remember getting a letter about one of those original unpaid debts stating we owed the balance. I never responded and I never got any other information. My loan officer gave me the account number and phone number to call Chase, but I am worried if I call them they they could reactivate this bill (which I think may be from long ago). I guess it could be a mistake too but I am more inclined to think it was from the old debt. Do you think I should call them? We got the refinacing loan; should I just wait and see if it drops off my report in the future?
Thank you