It really underscores the importance of using a framework like HFACS [0] in a situation like this, because you end up exhausting all possible sources of problems and ensuring that you reach the correct root cause. It seems abundantly clear that the forcing-function was getting the aircraft back into service as fast as possible, not as safely as possible or as carefully as possible. A well-designed organization would have said that any unexpected contingencies during the maintenance process would have led to a full re-evaluation of the situation to understand it. The moment the engine didn't match their understanding, they should have scheduled a replacement plane or cancelled the upcoming flight, and reset expectations about how fast the plane could be back in-service.

[0]: https://en.wikipedia.org/wiki/Human_Factors_Analysis_and_Cla...