Current system.log error messages

What follows are recurring error messages I’m seeing in the system.log, though my current 10.4.5 system seems to be running fine. I’m hoping to address each of these issues over time.

Here are some issues I’m seeing at shutdown:

Mar 10 21:38:28 Studio-Mac-G4 loginwindow[84]: sendQuitEventToApp (LAServer): AESendMessage returned error -609
Mar 10 21:38:31 Studio-Mac-G4 SystemStarter[2988]: authentication service (3008) did not complete successfully
Mar 10 21:38:31 Studio-Mac-G4 kernel[0]: at_obdev_KUC: sf_attach denied! already terminatingat_obdev_KUC
Mar 10 21:38:33 Studio-Mac-G4 SystemStarter[2988]: The following StartupItems failed to properly start:
Mar 10 21:38:33 Studio-Mac-G4 SystemStarter[2988]: /System/Library/StartupItems/AuthServer


Here are some issues I’m seeing at startup:

Mar 11 06:00:43 localhost kernel[0]: WARNING: ATA Drive claims FLUSH CACHE EXT feature support but does not claim Extended LBA feature support
Mar 11 06:00:44 localhost 152109056: cupsd's bootstrap server port not found