Tony, the owner likes his equipment to be in good condition, but as I think you are suggesting, he's resigned to running the carrier as-is over the summer.
I'll certainly pull the plugs again and give the accessible valves a "nudge". I was surprised I couldn't hear clearly where the leakage was coming from during the leak-down test, so valves stuck open enough that they don't hiss could be the explanation.
Thanks for the suggestions.
Malcolm
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