1 hour ago:
Buildzoid's dead Titan X video:
https://youtu.be/MunL4-DqFm8You will probably find good information about probing and determining the extent of the damage.
Spoiler: his has a dead VRM power stage, and he talks about how to determine which one is dead (if not already obvious) and how to determine if there may be bigger underlying issues. It's good stuff. Should be right up your alley.
He hasn't fixed his yet. He said that he will probably stream the repair attempt, and then also post a shortened update/summary video once it has happened. So, keep an eye out for that.