Looks like the drainage pipes are made of PVC plastic - am I correct? If so, this brings a different perspective.
I am leaning hard to a slow leak. Condensation on plastic is unusual - even in hot humid areas.
Are there water supply lines up in there? If so, what material are they made of?
Lastly, I suspect you have a high ground water temp - about 70 F (20C)?
Steve
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consulting on geothermal heating/cooling & rational energy use since 1990
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