You mean all instances of aolserver? Well, they need to be killed with -9 because otherwise they won't die, and after that issuing 'svc -u' has the same effect as described before.
I even played with killing the supervise instance, but without success.
I just set up aolserver 3.5 on another server with daemontools and it works fine. I have absolutely no clue what the difference on this server could be.