[Aurel]

If the shop is going to measure everything, the P&Cs will be separated, right?
I would rering them all. It only makes sense to not rering if the rings are left undisturbed in the cylinders. I would say, it will be even more of a gamble trying to reseat old rings than new rings. Measure ring grooves, have your cylinders cleaned, slightly honed with the sunnen paste and scotch brite pad. It will remain a gamble, but with lot higher chances of success than reusing old rings.

Aurel