Does that help According to the response for this thread in AWS forums, there might be some downtime if you're going to replace the certificate. But as long as you keep the old one there might not be any problem.
may help you . When you wipe your computer, you lose your public+private key pairs. This results in all certificates becoming invalid, and thus requiring you to remake each and every certificate. Don't forget that intermediate certificate (WWDR)
it fixes the issue You actually don't have to wait for the distribution to be deleted to reuse the cname. I do something similar. create a new distribution that has identical settings as my current one, minus the cname settings remove the cname from the old distribution, save immediately add cname to new distribution update DNS to point to new distribution keep old distribution around until both are deployed disable and then delete, to clean up