It's likely not the table, it's the head tilted at an angle. You can check that by measuring the distance between the table and the bottom of the X-Axis bar at all 4 corners. It should be the same. That'll tell you that the table is parallel to the sliding assembly. If that's the same, and not more than .030" of an inch out, then it's your head. It's been a long time since I've seen a Fusion in person so I can't say exactly how it would be done, but there should be some screws that hold the head to the assembly that the belts end up clamping to. You'd loosen those and rotate it until it's square. You should be able to take a precision square and stand it on the table and butt the edge standing up against the head assembly. That should get it really close. I doubt they even check that at the factory because to them, it doesn't really matter. To you, in your case, it does.

Just my guess at all it.