Restoring to "stock" with new ROM... do I need to "re-lock"?

[agent0014]

So like many here, I've been installing ROM after ROM on my phone. At the moment I have the "just barely pre-release" version on my phone. I've been having a lot of problems with the phone, some ongoing and some more recent. At this point I believe my best bet is to install the new official software and--if any of the problems are persistent--take it in for service. At one point I had installed DHarvey's ROM, and then after a few more, the pre-release leaked rom. To install the first ROM I had to run an unlocker... do I need to do anything to remove this unlocker/relock the phone before I can take it back to Sprint? If I do, do I need to do this before or after I install the official software off the site? Any input or reassurances would be very helpful, I'd prefer to not get nailed by support when I try to take the phone back. Thanks!