Here my own questions to the pros
Is what was done to the PN Islanders considered zero-timing
What would be the difference between "zero-timing" and "Inspect, Repair as Necessary" (IRAN)?
"Inspection and repair as necessary" is exactly what it sounds like. You check and replace everything that is broken. If a part has time on it that is not broken or needs replacing or is coming due to be replaced, it is not.
Zero timing is more involved including the refurbishment of the fuselage, engines and avionics to a like new condition, often regardless of it's current state. This is seriously more expensive. In the end, you get what is basically a new aircraft.
It really all depends on the contract. What the PAF and the private company agree too.