If you bought your rig new you should have received a manual for the furnace which shows a parts breakdown. If not you can ask for one from a Suburban repair facility. You can also refer to this
Furnace Information document put out by Suburban.
If you have an access door on the outside of your RV to the furnace you may not even need to remove it to work on it. This is the way it was on our older Fleetwood motorhome we used to own.