> SV:123456:respawn:/command/svscanboot

Try appending " > /dev/msglog 2>&1 < /dev/null" to that line, run
"init q", and make svscanboot executable again.  I expect init will
then start one new svscan, but no more.  You can then kill the old
svscan, and then:
svc -dx /service/*; sleep 1; svc -dx /service/*/log
All services and loggers will then be restarted under the new svscan.

paul