GPUs fans won't start and the machine freezes after a few minutes powered on, due to the high temperatures

One of our GPUs is not working correctly. Its fans won’t start and the machine freezes after a few minutes powered on, due to the high temperatures.

Would you know the best way to have this GPU replaced/serviced?

Here’s the info on the hardware part:

Nvidia TITAN RTX

Part Number: 900-1G150-2500-00 AE

We’re not using Windows. Our machines run Linux (Ubuntu 22.04 LTS, with the nvidia drivers installed from the official repositories).