I would think the first step would be to ask whoever you bought it from, or the builder. Assuming Phase 1 WAS completed, they could either direct you to the entry, or provide a written statement of the completion to you. Even so, I would take it with a grain of salt and conduct plenty of my own testing. Wouldn't be the first time somebody fudged the records, I would imagine. And it's still a low-time, relatively untested plane.
If the seller would admit that it was NOT completed (I doubt he would), you have other issues to work through...
Chris