Just wanted to share my experience in finding, accessing and repairing a Vacuflush toilet in a Fleetwood Bounder. My Bounder is a 2014 35K. I am sure that this may apply to older Bounders perhaps as old as 2005. However, I am not sure of that.
In the very rear see through compartment, open the cargo door from the door side( passenger side). Put your head and shoulders in side of the compartment and look to the upper right center. You will see a ( in my case) a
black panel that is about 27" x the height of the compartment. There are either 2, 3, or 4 Phillips screws holding it on. The reason for this is because who ever put the panel in made the decision that either 2,3,or 4 screws would do the job. The 2 screws closest to you are easy to get to. The one on the road side ( drivers side) is difficult to get just because it is such a small compartment. Me being short and fat didn't help either. When I put it back together I changed the Phillips screws to hex heads so I could get a socket on them.
Remove the panel and the Vacuflush pump and tank are right in front of you.
My friend who owns a 2012 35K decided to cut an approximately 27" x 27" hole in the very center of the compartment. It worked well as he was able to sit on a bucket with his head and shoulders through the hole which made it easier to work on the pump. I am still waiting to hear how he is going to patch the hole.
As far as the pump goes he had a cracked Bellows's in his which he replaced and it is working great. It is recommended that, while you have it apart, you replace the Duck Bills also. Pull up the schematic on a Sea Land Dometic Vacuflush toilet.
I hope that this information helps anyone who may have a problem with this type of toilet. I will be happy to answer any questions. Good luck.
By the way, I am Bounder07, my wife is summer queen.