Here are the apache virtual host entries for this cert:
SSLCertificateKeyFile /etc/letsencrypt/privkey.pem
SSLCertificateFile /etc/letsencrypt/cert.pem
SSLCertificateChainFile /etc/letsencrypt/fullchain.pem
I also tried to follow the steps related to deleting the last two entries in fullchain.pem and replacing them with two new certs, reloading apache, and I don't believe that worked either.