Hello,
My name is Alex. I have more them 5 years experience in administering production, customer facing linux servers. I'm currently employed by on of the largest SSL Certification Authorities as a Senior Linux Systems Administrator. I manage a server farm of more that 300 servers.
I've been using Plesk as the control panel on my own servers for the past 2 years. I've come to know it's workings very well, so I will be able to troubleshoot your issue with ease. I will require root level access to your server to check the logs and make the needed changes.
Thank you for your time and I hope you will consider working with me on this project. Please let me know if you have any questions.
Cheers,
Alex