I'd try Boulder Nissan. They sell a ton of Leafs and know all about them. They might even be reading this forum
For the warranty replacement, there are 2 concerns: one is a capacity warranty which triggers when the car shows 8 bars of capacity left. Your car isn't near that. This warranty on the 2017 is for 8 years or 100k miles. The second warranty is for battery defects. This warranty should cover your car since it has a defective battery module.
Nissan corporate or the dealer may decide to open the pack and replace the bad module or they may decide to replace the entire pack. There is a chance they will decide to replace the entire pack since it is much less labor and the 30kWh packs have been discontinued and replaced by the 40kWh packs (as found in newer Leafs) so replacement modules may not be available.
Best of luck and keep up updated.