It's an above ground, Atlantic 18', original liner.
As far as fixing the leak, do you recommend the dye test to try and isolate it? I should also note that there has been no (as far as I can tell) wetness around the pool at all since it has been covered. I also felt the bottom of the pool and didn't notice any squishiness in the sand underneath.
As far as adding water, what are your recommendations once I get a layer of ice on top? Thanks again!