We don’t know. However, it’s worth pointing out phases aren’t exactly as cleanly seperable as we sometimes think of them because we often visualize standard conditions, like we have on earth. If it has a “solid” part, it’s likely less a surface and more a composition change in what is already extreme conditions we could never reach.
Jupiter is a gas giant with miles of clouds going towards the surface, then thousands of miles of gas that transitions into liquid. Underneath that? No clue if it’s solid.
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