I have been very interested in this thread. In October of 2000 I got my first customer service job, at a company that was contracted to handle customer service for GM. I worked in Tampa, Florida but we also had offices in Portland, Oregon and Dallas, Texas. I started out answering phone calls for Chevy, Olds and Pontiac but it was not too long before I got promoted to a department called the Business Resource Center, or BRC. The BRC handled product allegation claims where people claimed their GM car injured them or caused a fire or other damage. We also had a legal group, but I worked in the repurchase group. We would receive files from GM field managers and area service managers all across the country to buy back vehicles that were about to go Lemon Law or even were just considered to be potential Lemon Law candidates.
Not once in the entire 4 years I worked there did I ever see GM buy back a used vehicle. Every single buyback was on a new vehicle sale, no exception. Some of the buybacks did get donated to high school and trade school auto shop classes. Some were put on a flatbed or train back to their respective GM plants so the engineers could study and try to fix whatever the problem was and possibly publish a fix to dealers. And a lot of the buybacks went to the crusher but GM never allowed any of them to be put back up for sale on anyone's used car lot.
I always thought those GM buyback cases were a mixed bag. Sometimes GM made it a very easy and fair process for the customer, other times the customer got the short end of the stick regardless. I know GM came out ahead most of the time. Back then it usually cost less to buy back a vehicle than it did to let it go through the Lemon Law and litigation process. The business world is different now. GM and other brands may do things in a more consumer-friendly way nowadays but I am very glad to hear Nissan made this right for OP.