there are two sides to this story. I have been working on aircraft for
more than 40 years , problems between the FAA & operators are a two
sided street , the fAA finds a problem asks the operator to fix then
things need to get repaired or fixed

there might be a lease that's not worded correctly or maintenance
issues if the FAA writes a letter or violation thru fars . it in legal
hands not good

he can ground aircraft & have you bring him or her paper work to his
office to show how things are fixed or repaired
& release the aircraft for flight

if they take the airworthy certificate things are not going well