Me thinks the "cooling system" upgrade to the Jabiru is the rebuild of 1 or 2 or more cylinders with new valves!
There is no upgrade available for the J160 cooling system.
Sounds like they are blaming the damage on cooling.
I'm surprised that after everyone posted on here about how the engine wasn't overheated, that the operator has said that they are getting a cooling upgrade.
When the big aircraft operators realise that Jabs and smaller aircraft are the training machines of the future, hopefully everyone will become more educated on how to drive them.