I know that we have very different MoHos but my bypass valves are located in the space below the floor of the main wardrobe closet. About a dozen screws to remove.
Look inside the coach for what is behind the WH controls, there is where you will most likely find the bypass valves. Mine is right next to the FAU and inside that false bottom area.
It is most likely easy to open up and access but a major pain just the same.
Let us know what you find the bypass valves, please.
By the way, welcome to the Forums. There is a lot of info here and a lot of nice folks too, just remember to help, we generally need to know the make, year and model of your rig, What the m, y and m of what ever you are having problems with, ie, 1990 Model 27D Bounder with an Atwood WH model number XXXX. And very important at some point, learn how to search by reading the sticky re searches and the sticky on posting pictures. I use but do not recommend PhotoBucket, it works for me and I'v got a lot of stuff on it so I don't want to redo all my posts that have pictures. TinyPic seems to be used as well as Picasso. Whatever your happy with. The Spell Check doesn't work but IE Virgin 10 does, i need to update this computer to IE 10. Several of us are Grumpy and give curt answers, disregard those of us that do, but, read what everyone has to say.
If you have electric steps, sometime you're going to have problems. No one here has all the answers to fixing Kwikee Steps. There are a lot of opinions but few facts.
All in all, it will help you to read first and ask later. Have fun and "Smooth Roads and Shady Campsites".
"I travel not to go anywhere, but to go. I travel for travel's sake. The great affair is to go". R. L. Stevenson
David Bishop
2002 Winnebago Adventurer 32V
2009 GMC Canyon
Roadmaster 5000
BrakeBuddy Classic II