Wondering what the best telltale tests i need to run on a tractor (new kubota 200 hrs) that overheated.

It overheated because kubota doesnt have any protection for the coolant lines and DOES NOT have a temperature warning alarm (just a dumb light on the dash thats extremely hard to see in the sunlight) and a stick got wedged up between the axle and radiator punchering it. By the time i looked down and noticed the temp gauge it was in the red.

What test should i run to see if i ruined my new tractor forever...? What telltale signs to look for that would tell me that the engine was hurt and will see problems prematurely in the future? Thanks for any info?

PS - posting here because a diesel engine is a diesel engine..