uninstall service pack from SLES 8

Hello, Does anyone have knowledge of uninstalling a service pack from SLES 8? I recently downloaded SP3 (which contains two ISO CD images). I installed from CD1 and encountered errors when it was removing the Mozilla-related files. After a time, the server hung and I rebooted. The server came up ok. I checked the /var/adm/rpmconfigcheck file and there were no indications of files which could not be updated. Since I have yet to apply the updates from CD-2, I would like to de-install all changes made from CD-1 and start over. I appreciate your feedback. Regards, Jacques V. Dejean Lead Systems Administrator, CSA - HPUX Alliance Entertainment (v) 954-255-4344