WP
I don't have any specific information that is not already in the public domain, but the fact that the pilot spent several hours troubleshooting the problem including talking on the sat phone to his company, Cirrus and I believe the ferry tank makers suggests that there is quite a good chance that we will find out what happened.
Also, as we know, the pilot had a camera with him and I suspect (but don't know for sure) that there will probably be a at least a photographic record of those parts of the ferry tank system that are visible.
As I said in an earlier post, the ferry company is a highly competent and reputable organisation and I am quite sure that the problem will have been documented as fully as possible.