So chime is buzzing as motion is activated at video doorbell, voltage at chime and button contacts is 13.35v chime is rated for 16v and video button is auto ranging 10-35v, so within voltage range, just lower at the chime, video is skybell HD and chime is Nutone , transformer is lost somewhere in buried closet ceiling or attic, house has had extensive remodel and owner and wasn’t happy with EC ? From builder. The lower voltage on chime wouldn’t cause chime to buzz?