Siemens OP15A Problem

I have a problem with one OP15A 6AV3515-1EB00
The program is lost in it, and when I start it up I get the message

$006 COM-Transfer Fail -No:0 Sts: 8

From what I know that means that there is no connection between the OP and the Computer, but I have the cable attached, and both the cable and computer works fine to my other OPs.

Does any one have any Idé?

If you havent already, check the manual there might be more info there.
You can find it here http://support.automation.siemens.com/WW/view/en/1887570

Hi Göran
I have exactly the same problem...do you know how to solve it now?
I am trying to retrieve configuration from a op15, can i do it using Protools Pro?
Thanks for your help