Thanks to all for the speedy and helpful responses. I had to get the 34QS from the parking lot to check them out. The washer-dryer is between the tankless water heater and the master closet in the 34QS. I looked on the tankless side, at the kick panel below the washer, the kick panel below the closet.
The correct answer is in the clothes closet itself. There is a panel with 4 screws. Remove them and there is access to the valves and the power plugs.
Of course, it is on that side because it is closest to the manifold. Duh.
That does make me wonder about the value of the Berkshire manifold:
1. There are a lot of shutoff valves all over the coach, so the manifold just gives one set at one point. But you need to use the others to drain the pipes, etc.
2. The water heater is right beside the washer, but the water has to take a 25 foot round trip to the manifold and back before it gets to the washer. Why not just run the washer from the heater for hot water and the supply line to the heater for the cold?