I decided to do this in SQL. In case someone else needs this, here's what I did:update ost_ticket, ost_ticket_status set ost_ticket.sla_id = "2", ost_ticket.isoverdue=0, ost_ticket.est_duedate=date_add(ost_ticket.created, interval 8760 hour) where ost_ticket.topic_id=12 and ost_ticket.status_id = ost_ticket_status.id and ost_ticket_status.state = "open";This finds all tickets that are help topic ID 12 and in a status where the ticket is in an open state, and then unsets the over-due flag, changes the SLA plan to the correct SLA plan ID, and sets the due-date to the ticket created date +1 year (same as the SLA plan, 1 year before it's past-due).Thanks