Looks like you can buy a replacement freehub body. I'm not familiar with Hope hubs, but typically the manufacturer doesn't recommend that you disassemble them. It may be possible to give it a try if you find instructions and the right tools. Or the manufacturer may be willing to replace the freehub body under warranty. I'd pull the freehub off, soak it in solvent for a few days, air dry it, see if the pawls operate, and then oil lightly.