Deeday
As you only have definitions so far.
The run out of the crankshaft is usually checked first to see if it has bent the crank.
I have seen a couple of very hard shock loads (a twin at full power with an early gear selection!) the cranks were fine and no damage anywhere in the engine/s!
Then a landing on grass at low/ idle power which bent the crank well out of limits?
The Magneto drive gear is inspected/checked/tested as this can fracture many hours after the shock load incident, I have a gear wheel with a very small crack in it and one with a tooth missing both removed from aircraft after hitting hard runways under power.
The bearings and other parts are inspected/replaced as a precation and some items must be replaced after they are removed/disturbed.
I'm sure someone who does the job/s will give a clearer description?