[Imp]

I am not sure but I think you only get the points back if you sell the unit not if you downgrade it. Never really paid enough attention but if you are playing computer reload & do following.

Sell a formation & buy a new one to see if get points back. I think yes
Also as intreasted but never confirmed.
Obviosly replacing a destroyed unit costs same as
Reparing a damaged unit costs part of points.
Now the question.
If you upgrade a damaged unit I think repairing it first is wasting points as it will still cost the same.
I actually prefer to save my points & upgrade a whole formation at once rather than doing piecemeal.
So if new tanks available I do not buy till I can replace the entire formation rather than having a mix in transition phase.