I found this guy's page that has all the maintenance for our Ford Expedition. He did write some details instructions for his Expedition. Please check it out.
2018-2020 Ford Expedition DIY Repair Guides & Vehicle Maintenance Instructions
Links to my DIY repair tutorials and vehicle maintenance how-to guides for the fourth generation 2018, 2019 and 2020 Ford Expedition SUV.
paulstravelpictures.com