I swore this was answered on the boards long ago, but I'm not finding it.
What class refit is moving around (non-destroyable) crits.
Stuff like FFA, Endo, or TSM.
I'm thinking it would be covered under Class-C, "move a component".
So for example, moving some TSM crits from Arm to Leg.
Or moving Ferro from RT to LT.