Just gonna leave my notes that I saved here quickly if others want to pursue this: (Warning: if someone comes across this in the future, if you don't know what you're doing you can brick your NIC, proceed at your own risk):
Flash files can be found on station-drivers.com Marvell/Aquantia AQC & AQN Ethernet Drivers & Firmwares
Useful thread for information Marvell AQC113C FourPartID Firmware Updater Discussion
AQC113 Flashing