Repair person for complex metal door?

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Anybody have anyone to recommend for a vault-like interior firedoor? I have a couple early 20th century firedoors in my house and they have stopped working properly and I’m not sure how to fix them. They don’t have complicated locking mechanisms like a safe door but are very thick and made of metal with springs and counterwieghts and special heavy-duty doorhandles and latches that are now missing parts. Any ideas? Not looking to DIY–I think this might be a relatively easy job for someone with some familiarity with this kind of thing and access to parts.