Not going to happen buddy. try installing a fresh copy of sql server somewhere else upgrade to sp3, restore your system db's there, upgrade to sp3a then move the system db's to the live server. hope this helps.
Thanks - that's what I thought. However, how can it be determined which SP (3 or 3a) a given instance is running? @@version returns 8.00.760 for both of them, & Properties in EM show SP3 for both. I remember there being a way to find the build number, but I don't know how to get it. TIA.