There should a repair guide being put up in a couple days for cases when you need to replace the screen. Just hang tight! Also, you can purchase a new Google Nexus 9 Front Panel Assembly to replace your broken screen from the iFixit website by just following the link.
If you are still thinking about sending it back to HTC, have you checked the warranty for the Nexus_9? Usually the warranty does not cover damage such as a bad screen, but maybe for this device it does.
Best of Luck!
Kelsey
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