There is a "kill switch" between the cold/hot water pipe and my washing machine. For the 2-3 months the switch has gotten more and more difficult to turn (both ways). What might be the cause of this issue, and what are the possible fixes?
As you can see in the enclosed picture, the switch is very close to the dry wall (and to the washing machine), so I'm concerned about the cost/work involved to get this fixed; any info/suggestion about cost, etc. is most appreciated. Because of COVID-19 I'm hesitating to have other people coming into my place, at the same time. I don't want a water leak (the washer is in the second floor! -- there is no leak at the moment or in the past).
I have not done anything to the switch since I moved to this place (20+ years). What was the "maintenance" I'm was supposed to have been doing all these years (and in the future)?