The manuals for campers are somewhat generic. When it comes to the appliances, go the manufactures website or do a google search and download the manual for each appliance. The new Sabre 5th wheel has basically the same switch panel as my Columbus.
What I have done while on a road trip is to stop at a FR dealer that sells a camper that is close to my Columbus. Sabre is dang close. How you operate, troubleshoot, repair, etc. is the same on many models that are close. ALL dealers tend to be helpful in their parts and service dept. when you have questions. Get free help from them and return the favor by shopping their parts dept. IF nothiing else buy a 4 pack of rv toilet paper and say thanks. If you have women camping with you, you will always need more toilet paper soon.