I just got a new Doughboy pool and I recall the dealer offering an extended warranty because (I believe) the Doughboy warranty only covered the liner itself and not the installation or water costs. Check your Doughboy documentation and the contract from your installer to see exactly what they cover and specifically do not cover.
I did not purchase the extended coverage by the way.
I don't know how to help you find the leak. I have read from other threads that finding leaks can be very difficult but if you can see wetness that may make it easier to find. The only suggestion I can think of is to drain the water below the skimmer and see if the wetness continues. That would at least isolate the problem to one small area.
Good luck.
Peter
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