No printers or Local Airport connection after 10.4.11 Update

Upgraded from 10.4.10 to 10.4.11 on a G5 PPC iMac. Now my network printer (connected to AirPort Extreme base station via ethernet cable) & my USB printer (connected to iMac via USB cable) are missing. Also am unable to connect to my AirPort network. In Printer Setup Utility no printers are listed & when I attempt to add a printer I get a spinning wheel with the message "searching for new drivers". This goes on for about 5 minutes. When it finally stops & I attempt to add a printer using the same settings that worked under 10.4.10 I get the message "server-error-service-unavailable".
When I attempt to connect to my AirPort network no servers are shown & when enter the name or IP address of my PowerBook (which I was able to connect to under 10.4.10) I get the message "the server may not exist or is not operational".
Seems to me these two problems are related but I have no idea how to resolve them. I've tried repair permissions, Disk Warrior, reset printing system, disconnected/reconnected all AirPort cables, power cycled printers & disconnected/reconnected their cables, restarted the Extreme base station, deleted print .plist files, ran the 10.4.11 combo installer again etc, etc. all to no avail. Any ideas?

ok, I got it fixed... after reading thru the post here: http://discussions.apple.com/thread.jspa?threadID=1297388&tstart=0
I replaced usr/sbin/cupsd and usr/lib/libcups.2.dylib with my pre-update backup files, rebooted, and then I could re-add my printers. Seems to all be working now.
You'll need something to show hidden files (I used Cocktail), and you'll need root access (I think) to access and replace these files.
IMPORTANT! Note that as administrator, it allowed me to move the file libcups.2.dylib out of /lib into the trash, but wouldn't allow me to copy the backup file (or the original) back into /lib... and then wouldn't restart at all without it... I had to boot from my rescue drive and copy the files with root access. So be very, very careful.

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