Help! Black Tank Flush Vacuum Breaker Leak

[twoballscrewball]

2016 X23F.

I had noticed some water in the floor of the cabinets under the side bed and I have determined through creative use of a cell phone camera that the vacuum breaker / anti syphon / check valve / whatever you call it is leaking when I flush the black tank. Thankfully it's all clean water.

I have no idea how I would access this thing, as it is buried in a corner and I don't see any easy way to get into the area. It seems all of the panels were attached from the inaccessible side, probably as the trailer was built.

I can see it if I remove the cover over the rear electrical box where the 120V line comes in and stick a camera in there aiming toward the rear left (sewer side) of the trailer.

Any ideas how I can service this thing?? I was thinking maybe remove the outside shower which seems like it might get me access? Any other ideas?

[Camper_bob]

Depending on what wall it's behind, you could cut an "access" panel? If it's in an inconspicuous place, that might work...?

[PaulB12]

Just get creative. I had to access a space that wasn't designed to be accessed. I had to pop staples on a cabinet bottom, then pop staples on blank panel. Got to what I needed. Left blank panel off and found a cabinet door(had to modify). This made easy access for any future problems and gave me some storage I didn't have before.
Look around and be creative.
PaulB12