PowerEdge T110 II intrusion status cannot be reset

Hi,

I have a PowerEdge T110 II that has the Health Status indicator blinking amber. At the OMSA, the problem was the intrusion alert. I did opened the cover before but now it is closed. How do I reset this alert? I have read somewhere to go to the bios security setup to reset it but there is just no intrusion setting there at all. I have even updated the bios to the latest version. Any help much appreciated.

Thanks