I'd still be interested in seeing the output from that grep command.
This sounds like a buggy background script or something in the inittab. If it's not in the inittab, I'd go looking through the startup scripts on /etc/rc2.d and /etc/rc.d/8. Those should all be text files, so you can grep for "105" in those as well:
# grep 105 /etc/rc2.d/*
# grep 105 /etc/rc.d/8/*
Also, you could look through the contents of /usr/spool/cron/crontabs. Error there wouldn't typically appear on the console, but can be forced to do so.
Any hint as to when this started, and if there was anything changed on the system shortly beforehand?
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