I did the bucket test about a week ago with a suspected leak, and sure enough I was losing about 1/2" per day after evaporation with pump on or off. Got down to the bottom of the skimmers, then stopped.
I Doubt the leak is in the piping from the skimmer lines, because both skimmers are holding water just fine. I would imagine if a pipe was leaking the area of the skimmer that holds the basket would lose water rather quickly after the pool water dropped below the skimmers.
But now I have no idea what to do. No visible cracks in the skimmers, I did the dye test earlier around both skimmers and I could not see anything. Should I re-do dye test and try to see if I can narrow it down to one or the other? Should I replace faceplates on both and see what happens? How easy is it to replace a faceplate?