def METHOD_NAME(self, subsystem, prop_name):
    value = subsystem.config.get(prop_name)
    if not value:
        return
    events = set(value.replace(' ', '').split(','))
    for replacement in UpdateAuditEvents.REPLACEMENTS:
        old_event = replacement[0]
        new_event = replacement[1]
        if old_event in events:
            events.remove(old_event)
            events.add(new_event)
    event_list = ','.join(sorted(events))
    subsystem.config[prop_name] = event_list