Hello,
I’m pretty sure fix Standard MySQL cert error · openemr/openemr-devops@9ea0a9f · GitHub picks up those changes. If you’re using a version of Standard that predates it and you need to pull in a certificate file manually, that patch will show you where you need to put it. See https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/UsingWithRDS.SSL.html for more information about where to get a valid certificate file.