The Triple Water Valve WH13X10053 / AP5629504 allowed a constant drip into the drum, and the valve malfunctioned on WARM or HOT. I unplugged the power cord and removed the supply hoses from the valve. I removed the three screws from the back and moved the control panel out of the way. I unplugged the electrical connectors from the valve and removed the two screws attaching the valve to the washer. I loosened the tiny clamp and removed the small hose from the valve -- it was sealed on tight and was the only difficult part of the job. I swapped the valve and reassembled and reconnected everything.
Advice: I cut my finger on something sharp when removing the valve, so you may want to wear gloves. And if you moved the washer to perform the repair, don't forget to rebalance it when you're done.
Thanks to same-day shipping, the whole job was completed the day after ordering the part!