BPF - it is the KFC225 and you do have to adjust the pitch/roll nulls which are two trimpots in the side of the KC225 computer.
Whether this is
actually needed depends on how much different the "repaired" KI-256 is.
A new KI-256 is $11k
I once paid $3k for an overhaul exchange unit from the USA but this is a waste of money because one can get the mechanics (only) sorted for a few hundred £ here in the UK.
California... Mid Continent? They did my current unit, 200hrs ago. It came 2 degrees out in roll. I had no choice but to install it and fly with it, but this time I will get it fixed properly.
I wish I had a spare unit (I have loads of spares for exchange purposes) but this is one spare I haven't got.