I saw the large interest in the links that Perderabo posted. I know that I appreciated the links. Sooner or later they prove useful. Here are some more links. Sorry that some are specific to my environment.
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IBM pSeries firmware and microcode website.
IBM Support
AIX Maintenance level update website.
Quick links for AIX fixes
IBM Publib documentation link.
pSeries and AIX Information Center
edit by bakunin: thanks for the input, i have added the links to the pinned posting by perderabo