Tony Williams at Quick Charge Power - Was able to provide a solution that was around $125 + 30 min labor. Looks like something just about anyone can do if you aren't afraid to mess around with splicing wires. He got back to me quickly and even took apart his own car and took photos to show how easy it would be.
Stadium Nissan - 2 Days with no call backs. I actually went in yesterday and confirmed they were quoting the wrong part. Never got a call back from the service manager despite the visit and 4 phone messages left over 2 days.
Buena Park Nissan - Was there for around 40 min. They confirmed I had the right part number and it would be repaired under warranty. The parts ordering system was down so I'm waiting on a call back as to when they'll be able to get the part, but I've got my car back and will just charge using CHAdeMO ($$$$) until it gets fixed. Luckily there's a number of CHAdeMO stations around, with 1 along my route home. They just called back and I've got an appt on the 20th to get it fixed, as it will take a week to get the part special ordered.