Thanks for the suggestions.
1. My manual does not show diagrams or locations of any plumbing stuff.
Airstream said they no longer had these manuals.
2. I will look under the cabinets in the right side kitchen and the left side
bath. Our filler is on the left side and the leak appears under the dinette
so, I'll also look beneath that drawer.
If anybody would sell photocopies of that section of a 1994 Land Yacht 34
Manual, I'm a buyer! It's a Diesel Pusher with left side shower and sink and a right side kitchen.
I'll got to the storage garage nest week and try again.