How to remove a AD server that will not be replaced

I have a network environment that contains 3 AD servers. Server a, b, & c

Server A  Server 2000 AD,Primary Internal DNS, & DHCP, Golbal Catalog
Server B  Server 2000 AD replication, Golbal Catalog
Server C Server 2003 AD replication,Secondary Internal DNS,Golbal Catalog

Server B's harware is showing it's age and I wish to retire the machine from my network and not replace. What is the best way to take it out of the Active Directory? Do I run DC Promo or what?
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How to promote and demote domain controllers in Windows 2000

And pray it works, otherwise it isn't pretty:
How to remove data in Active Directory after an unsuccessful domain controller demotion;en-us;216498 or

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If Server B is just a Domain Controller and Global Catalog server.  Then all you need to do is demote it using DC Promo.  If it has any of the FSMO roles (PDC Emulator, RID Master, etc., etc.) then those need to be pushed off to the other servers before the demotion.
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Windows Server 2003

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