Water inlet valve

Hi, Have read several posts concerning this model and water inlet problems and I'm convinced mine is having the same problem. Unit will run normally if i  put water manually in the tub, drains normally, but no water will come in through the water line. Checked that line and its not the problem. How do I get access to the water inlet valve? From back of unit (doesn't seem possible) or do you turn the unit on its back and go from underside?
thanks,
Dave