We have a Nutone master station - IM-4996 series - in the home we just purchased. It's biscuit colored. The hinges are broken on the door on the left bottom that hides the controls. Is it possible to purchase new hinges or a new door? If so, how much? We also have a doorbell/intercom in the front of the house. I think it's an IA70AB. It works fine but is all corroded and I want to replace it. What parts would I need and how much would they cost? Thanks. Nancy White

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