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I think they just wear out. Seals contract in the cold. I have a lot of parts trucks. I usually swap the kneeling valves for regular elbows on crappy tires on the parts trucks. The new style ctis valve assemblies eliminate the elbow.
I have seen them for sale online. No one retailer I can recommend over another though. It is a public available part. Used on the rear wheels where there is no kneeling valve. I hate those kneeling valves. Nothing but trouble. Maybe you can fill the release screw mech with rtv and once it gets...