One GPU not detected in Ubuntu

Hi,
I am a researcher working in HPC. We have a machine with 4 Nvidia TITAN Xp GPU cards. But the system recognizes only 3 of them. How to debug which card is problematic and how to go about debugging the issue? After reading the forum someone suggested to run nvidia-bug-report.sh. Here is the generated file. Can someone please help me with this?
Regards,
Keyur
nvidia-bug-report.log.gz (1010.8 KB)

The fourth gpu is completely invisible in system config so you should check if the card is properly powered and working at all (in another system).