Well I finally got around to checking for the leak. I submerged the keg so that both beer and gas connections and lid were submerged for at least 1 hour and set the pressure to about 20psi. I was hoping to see a stream of bubbles, but saw nothing. That leaves the CO2 tank, regulator and hose connection to the CO2 tank. I made sure the regulator Oring was in place and the nut was tight.
To test the regulator,I tried making a cup with duck tape to hold some star san to see if that was where the leak may be, but I could not get a good seal around the hose, and the star san leaked out.
One thing I have not yet tried is to turn the CO2 on with just the regulator attached and leave for a week or so to see if the CO2 volume drops, but that means no homebrew for a while.
So does anyone have any more ideas of testing the regulator, hose connector or tank for leaks.