I am working on an accounting project for a class. I have three A/P subsidiary ledgers. One w/ a "Zero" balance, one w/ a $5,117.15 balance, and one w/ a $3650 balance which has been sitting there for two months. I know the $5117.15 is correct because it was given to us by our instructor as a check number.
However, the balance in my A/P control account is $8238.00. I have gone through my transaction list and my CD journal and my Purchases journal and cannot find my mistake. Is there a better way to go about looking for it?

Thank you