Welcome to the wonderful world of posting, AlpineSFO!
1. Flight: DEN-SFO
2. Date of flight: 1/28/2020
3. Date booked: 12/18/2019
4. Fare basis: k
5. Cabin upgrade: Y --> PZ
6. Date of upgrade: Day of Purchase
7. Number of PlusPoints: 20
Nothing special about this -- I checked all of the flights on 1/28, and this was the only one with PZ availability.