Thanks, Dennis, for this valuable additional information. I must admit that I have a bit of hesitation about tackling this job. I have been up on the roof today as part of a total wash job, but crawling/rolling/scooting along under the belly of the beast is not something I think I would enjoy. It is only my being a Scot that makes me even consider it, as I know that the cost of labor to repair that sticky valve might be pretty high. One way or the other I'll have to get it done.
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