cyclic,
I have been involved (on the fringes) in the arrival of a new type of aircraft and seen the snags and hassles that have been found. All new aircraft have a "settling down" time where the maintenance guys have a learning curve and the manufacturer depends on their feedback to improve their product as a consequence of this.
I have seen avionics do things that had the tech reps puzzled, wires chafed through on panels and the structure, pipes chafing and cracks appearing where they were not expected.
Those of you who have bought new cars or bikes should know about recalls and things breaking. Aircraft are no different, except that they get more column inches if things go wrong.
For what it's worth, the new aircraft were not Sikorsky, but that does not make them any different.