Anyone know how to fix a marvel cabinet?

so my school’s marvel machine has been broken for a while now, it has no unlocked characters, 0 experience, and the guy says he turns the machine off and everyday after he turns it back on it starts the same way with no unlocked characters, 0 experience, and 24 credits on the machine. he chalks it up to being an old game but does anyone know if this can be fixed?

Replace the battery on the motherboard, pretty sure it’s a CR2032 but verify by taking out the old one first. The battery is located directly underneath the cartridge.