Network Problems after recent upgrades - 2.6.24 kernel?

[Peter J. Stieber]

I'm running the x86_64 version of F8 on a dual AMD Opteron box.  I 
regularly run yum update to keep everything up to date.  On March 9 I 
ran the update to get the most recent kernel 
(kernel-2.6.24.3-12.fc8.x86_64), but I didn't reboot to actually start 
using the latest kernel.

I ran yum update again on March 13.  After this update, I rebooted and 
tried to use the new kernel.  I lost my network connections.  I have two 
network connections.  One is a built-in Broadcom BCM5703C Gb Ethernet 
adapter on a Tyan K8W-S2885 MB and the other is a Gb PCI card.

lspci output...
02:07.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8169 
Gigabit Ethernet (rev 10)
02:09.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5703X 
Gigabit Ethernet (rev 02)

If I boot the prior kernel (2.6.23.15-137.fc8.x86_64) the PCI Realtex 
adapter came back, but not the on board Broadcom adapter.  I noticed the 
  ifcfg-eth0 and ifcfg-eth1 files in 
/etc/sysconfig/networking/profiles/default were modified on the reboot 
date (March 13).  I found ifcfg-eth*.bak files in 
/etc/sysconfig/network-scripts.  I backed up the files in 
/etc/sysconfig/networking/profiles/default and copied the *.bak files, 
but this didn't work.

Can someone suggest what to do next?

Did the kernel update change these files?

TIA,
Pete