Agree! I don't know the answer, but I imagine that everything is checked and lots of items are simply changed out especially after a 24-hour event like LeMans. Some series such as Indycar and F1 require a minimum mileage from engines and transmissions with the idea of reducing cost; if the engine or trans is changed before the mileage limit a penalty is imposed. Don't know if the sanctioning body in this case (IMSA) has such a rule.
I read a funny story about the #68 Ford that won at LeMans this year; after the race the chief mechanic was informed by the officials that because they won they would have the "privilege" of having their car in post-race scrutineering (tech inspection) for up to 2 weeks! Needless to say he was not impressed especially since the car would have to race again on another continent in 2 weeks.
