You iSeries guys know what this is about... Was doing an IPL to load PTFs (CUME, Hipers, DB, etc...) on my backup iSeries 820 today when I got an SRC B6000901. I looked this up and the book said I would have to reload the Licensed Internal Code. I didn't like the sounds of that, but after speaking with support I'm starting that process now.
FYI, we generally don't apply the PTFs permanently before we load new fixes. IBM told me that we should start doing that. This will verify the link loader (which is what our specific issue is), clean up orphaned objects, verify indexes on products, and gain a small amount of disk space back.
I'm coming up to load LIC from the CD now and then loading all the fixes.