If you are using the shared Elastx SSL certificate then your are all set, SSLv3 is already disabled.
If you are using your own certificate then you want to make sure you have disabled SSLv3.
Nginx load balancer and php:
Edit the file /conf.d/ssl.conf and find the line with ssl_protocols and make sure you remove SSLv2 och SSLv3. Then restart Nginx.
ssl_protocols SSLv2 SSLv3 TLSv1;
Edit the file /conf.d/ssl.conf and find the line with SSLProtocol and make sure you remove add a "-" in front of SSLv3. Then restart Apache.
SSLProtocol -ALL -SSLv3 +TLSv1