How much will it cost to come and replace a water solenoid valve on a samsung washer. I used a Samsung online diagnosis to order the right (hopefully) part?

Washing machines are equipped with solenoid-controlled valves that regulate the flow of hot and cold water into the machine. These valves are turned on and off by a timer or control board; by varying the length of time each are open, the washer's controlling device can regulate the water temperature inside the drum