Please refer to regulatory docs in DLC: https://developer.nvidia.com/embedded/dlc/agx-xavier-regulatory-compliance-docs, ITAR is not supported.
For a cooling solution please refer to ecosystem: https://developer.nvidia.com/embedded/community/ecosystem
No wet capacitors on board.
No vacuum test done as you can see in the tests table in module datasheet: https://developer.nvidia.com/jetson-agx-xavier-series-datasheet