That's something that is VERY hard to say. Which is all the more reason to take it to a professional. They can, or should, be able to test the various traces to ensure you're not replacing something pointlessly. Honestly, it's a very rare occasion that anything aside from capacitors can be replaced when damaged and result in a successful repair. I'd give it a go if it was just a cap, because those can simply fail from age or excessive ripple, over time. Other components like the mosfets or other VRM components, usually don't fail unless something else is wrong or something gets shorted out.
Generally, when I encounter a board failure, the board gets replaced. Still, it may be worth taking to a tech for their opinion.