There is a shop in Chicago that will do this sort of work, replacing or updating any hybrid or electric vehicle pack I bet. Probably just to original specs, or installing a new or used one.
I pulled a PTC heater out of a 2013 Leaf salvage they had there, they had already removed and done something with the pack, I assume put it in someone's car for them. They had all manner of vehicles on site; Prius, GM 4 mode hybrid trucks, etc. The guy there was a little grumpy with my dickering antics, but I got a working PTC heater for $50 (my gamble, it worked). Aside from being grumpy, they did seem like they knew what they are doing and there were a couple customers there they looked like they were actively at work.
Their website looks like they will build replacement packs and ship to a pre-vetted capable shop local to you for installation.