Easy way to get to the back of the HW heater in a 3400 is to open the doors on the cabinet (on the entertainment side) look for the screws in the back wall and floor of the inside of the cabinet, remove (4 on ours) remove pasnels and there you are, total accessability to the water heater. Bye the way, I also removed the inside of the one way valve then drilled it out for more water flow, works great, no humm, been that way for over 3 years.
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