From what I have seen the Yamaha hybrid grands have "a grand piano action" though with some differences from the acoustic grands. A trivial example might the steps necessary to pull the action for service; more technical differences would include specifics about the electronic components and what is required to keep them functioning properly. ISO Yamaha tutorials, tech bulletins, self-study courses, etc, that would facilitate my ability, as somebody who can regulate an acoustic grand, do the same for a N# hybrid. Thanks for your tips and guidance.