I used a light coating of lube on all orings and the relief and poppets while re-assemblying the kegs. I pressed up one keg to 30psi and put a gauge on it. The next day it was down to 24psi and the next day down to 23psi. There is no fluid in the keg, just the gas. Has anyone tested in this method and determined what an acceptable leak rate is, or should it have held 30psi indefinitely? If this is poor, I will do the soap bubble test on it.