SERVICE OVERRIDE is a file I use to generate SERVICE NAMES. It is not
used by LISTSERV, just by a private EXEC. You'll just have to edit
SERVICE NAMES, if it's just 2-3 lines and temporarily it shouldn't be a
problem. If you want something more permanent, use LSV$DNT to introduce
the change in DOMAIN NAMESUM (which is what LISTSERV needs SERVICE NAMES
for).
Eric