Welcome to the Forum from Western New York State!
Here's a "sticky" post in the General Jayco RV Chat forum with a printable PDI checklist.
https://www.jaycoowners.com/forums/f...ted-36094.html
This is THE single most IMPORTANT time you'll have at the dealer to learn about your new RV. Don't let them rush you through it or charge you for it. You should make absolutely sure you know where everything is, how it works, and what to do if it malfunctions. Take notes, videos, and ask questions until you're satisfied with the answers. The PDI should take hours to complete to be thorough enough.