I've changed the Prepayments and Prepaid Orders to the account it was supposed to be (whoops). However the account for Deposit Acct. Bal. (Unearned Revenue) is still not balanced with Pre. Ord./Deposit.

Have a look at the old accounting software/system to see what the 7650.00 is made up of. Looks like there was a deposit made previously by a customer ( or more than one customer) and it would have likely debited the bank and credited Deposit Acct Bal

The $7650 is unearned revenue from 2 clients. I've tried that and then my trial balance is not longer balanced, and matching with month-end.

Are you able to see how the original  unearned revenue from the 2 client was recorded by pulling up the receipt payment and then display the journal entry thru Report at top of Receipt Module?

It looks like the Deposit Balance Acct on left side was recorded in history mode but the 2 client's unearned revenue was not entered to offset that on the right side.

Currently is the unearned revenue for the 2 client showing up as a negative number in the Acct Receivable aged listing? Depending on how it was posted (or not posted) it may be just a matter of unlinking the Pre Ord/Deposit.