I had a couple of glitches. I forgot to update my wp-config.php to update the temporary URL’s that had pointed to my Amazon EC2 instance prior to the DNS change. With that change and a W3TC cache purge things seem to be working ok.
I also changed my WordPress theme to Twenty Sixteen. with only a few changes to make it mostly look like the old site. No custom PHP changes at this time. I like that it’s mobile friendly and responsive, probably good enough for now.