I need to change some Attendance Codes from previous academic years, how can I do this?

As long as you were on ScholarPack when these marks were entered you will be able to edit them like you would normal attendance. Go to Register>Manage Register and input the date you need to edit attendance for. Please note you can only do this up to 4 weeks at a time. Now simply click on the attendance code that is currently there and it will expand and give you a dropdown to choose a new code.