Edit enrollment type AFTER class has ended - HELP!

Good afternoon! I have a senior who has just graduated whose transcript shows 0 credit for a class, despite him having taken and passed it. After investigating, it seems his enrollment type was somehow switched to ‘audit’ and not ‘regular’. Even when I go into edit his grades, the boxes for credit are grayed out. How can I go back and enroll him ‘regularly' or force his credit to show??

Thanks in advance!!