John, this probably won’t make you feel any better. I have all the manuals that came with my coach.
many of them are installation and use manuals for each individual third party component plus two large manuals for the chassis and Fleetwood. They do not contain the information you are looking for.
Just like cars come with owners manuals, not service manuals. The nitty gritty service aspects of your coach were not part of the documentation.
On the bright side, you have the years of experience available to you in this forum and on Facebook.