Never mind. I figured it out
So here is what finally worked:
1. Raise the bed and prop it up. (I used the pole from the table)
2. Remove the drawer just above the water heater
3. Take out the two little screws holding the hatch below the drawer
4. Success! The three valves are right there and easy to reach.
Sorry if anybody went to any trouble to help me on this, but maybe this will help someone else.
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