1. Where can I find configuration details of the preconfigured VDSL2 profiles? The only information I can find is associated Data Rates.
2. Is there any way to restart the internet connection e.g. by dropping and reconnecting it or restarting the modem?
3. Where can I check for updated firmware for the module?
2. JTAC's suggestion is to disable the interface with a commit confirm. Not an elegant solution, but there you go.
3. Despite this article implying there is firmware, apparently none is available.