Is it possible to tell which of those messages trigger the SERVEROP?

The following code might help you do this.

Put this in remotes
Code:
alias debugToStatus {
  echo 4 -s $1-
}


then type /debug -i on debugtostatus
in the correct server window.

Set your SERVEROP parser to echo to status window.

Do what you did to get those messages again, look at the message that comes directly before what ever you're echoing to status window on the SEVEROP event.