IIRC, Xantrex bought out Heart years ago. I don't think Xantrex has a clue as to what's "under the hood
A friend in the UK has the same Freedom 15 we do and reports he can't get it serviced. They're pretty big hunks of metal, too. Mine is an older model with the 2/0 wiring
firmly attached to the box, unlike the newer ones where you had to provide your own wires but at least had the advantage of being able to remove the box and leave the wire in place. I simply can't.
Whatever you need to do is something it appears you
will have to do. And, most likely, will be done better anyway.