Using the labels on the back of the PCB locate your faulty switch.

Begin desoldering by carefully applying the hot iron onto the two solder joints surrounding the key label.

Use the solder pump when the solder visibly melts. Continue this process until the switch pins are visibly unsoldered from the PCB.

Warning: Do Not Breathe in the soldering fumes.

Warning: Do Not Touch the hot tip of the soldering iron.