Unlike a house, it's easy to shut off your pump or turn off your city water for service so there are no under sink shut-offs. There are two good sources where you can research this, Winnebago's plumbing diagrams and Winnebago's 3-D parts manual.
The plumbing diagrams, like most blueprints or engineering diagrams are somewhat hard to follow but the 3-D parts catalog is easier and has rotatable 3-D diagrams so you can physically locate parts. Note that, there are two sets of these for the 2015 Vista, both based on the serial number of your MH. Nonetheless, I took a look at the parts catalog for both the lower and higher serial numbers and couldn't find any such valves. These parts manuals are complete and, if there were valves, they would, indeed, be listed.
https://catalog3d.winnebagoind.com/menu/Parts.htm
https://www.winnebago.com/Files/File...m/Plumbing.htm
This leaves the question of what's wrong. The 3-D parts diagram works very well in terms of locating parts, following plumbing tubing, wiring, etc.
1. After you open the parts catalog specific to your MH's SN, select
Plumbing in the index box.
2. Then select
Water System
3. Now, locate the lavatory faucet in the 3-D diagram and double click on it. The diagram should zoom in on the faucet. Alternatively, you can locate the faucet in the parts listing and double click on it (#50 in low SN diagram, #82 in high SN diagram). Once you have it, you can put your cursor on the diagram and manipulate the 3-D drawing.
4. As you do so, it becomes clear that both the hot and cold lines feeding the faucet T into the main hot and cold lines feeding your shower, etc. There are no valves. Since everything else works, the problem has to be in your faucet. It's the only place the hot and cold lines come together. There are two other, unlikely possibilities: Both lines could independently clogged, which is highly unlikely. They both could be disconnected, in which case you'd see a lot of leakage.
5. The first thing I'd check is your faucet's aerator. Hopefully this simply unscrews just like your faucet at home. If that's OK, then something must wrong with the faucet itself. If the problem was with your single lever kitchen faucet it could be the replaceable "cartridge" that mixes the hot and cold water but the two handle lavatory faucet has no replaceable parts. If the aerator isn't replaceable, you'll probably need to replace the faucet, in which case, get a residential faucet from Home Depot or Lowes. It's likely to be higher quality and more repairable.
By the way. Here's the link to Winnebago's Owners Resources page which has the links to many useful items:
https://www.winnebago.com/owners/owner-resources
Let us know what you find out.
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