What's the rules on double posting? Doesn't seem to be any discussion on it. But I WOULD of thought there would be a policy which would mean you need to edit rather than posting twice.
Even if there's not an actual rule on this, I'm pretty sure it's considered good form to edit rather than repost. Relatedly, I've seen that people can bump their service thread like once a day or something. Does editing the last post also generate a bump in the forum listings?
The old bump must be deleted once you make a new one. Editing your post wont bump it but it will make the thread 'unread' to people even if they've already clicked on it (but wont bump it).