You'll want to delete and recreate the paycheques, so you can choose the correct bank account. But before doing this, please be sure to take a screenshot of the paychecks or save the pay stubs for your record.
To delete a paycheck:
Seelct Employees.
Under the Run payroll button, select Pay cheque list.
In my opinion, it is not necessary to do what JessT explained. Simply open each paycheque, and choose the drop-down list at the top left of the cheque window and change it to the correct bank account. Yes, you'll have to do them one by one, but that will be a lot faster than copying them all, deleting them and re-running the payroll.
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