yum update fails after FC3-->FC4T3 upgrade

[Don Russell]

Started with FC3 system.
HW is Toshiba Satellite S103-1115 laptop

I burned the DVD iso image to a DVD-RW that used to have FC4-T2 on it... 
the disk (dvd) label was not changed... Does that matter?

The newly written DVD passed the media test.
Installed FC4-T3 from DVD, choosing "upgrade".

Everything seemed to go fine, until I tried to "yum update" after first 
boot: It looks to me like it's going to a bad URL for extras... but why, 
and how do I correct it?

Thanks,
Don

[root at natasha ~]# yum update
Setting up Update Process
Setting up repositories
development               100% |=========================| 1.1 kB    00:00
http://download.fedora.redhat.com/pub/fedora/linux/extras/3.92/i386/repodata/repomd.xml: 
[Errno 4] IOError: HTTP Error 404: Date: Wed, 11 May 2005 16:50:37 GMT
Server: Apache
Last-Modified: Wed, 11 May 2005 16:45:09 GMT
Accept-Ranges: bytes
Content-Length: 4064
Content-Type: text/html; charset=UTF-8
Trying other mirror.
Cannot open/read repomd.xml file for repository: extras
failure: repodata/repomd.xml from extras: [Errno 256] No more mirrors to 
try.
[root at natasha ~]#