[olddog]

I like Rick L proposal of putting the intake in a tank of water. Drop the pressure back to 25 psi so your block off plate gaskets do not leak. Then watch for a bubble. Stare at it a good while.

You were keeping a constant pressure from the bottle and I think I read you were using some type of sniffer. Maybe I'm confusing the freon thing, but I didn't understand your method of looking for the leak. I would think blocking the gas in and watching for the pressure to drop off would be more of a standard test. I guess I'm not certain that your test was absolutely conclusive. Maybe it was and I just lack the understanding.