I finally made time to fix my issue. The fix was to install Sharkbite fittings model UP532Z5. The threaded nut on the fitting is shorter allowing the seal to be properly compressed. See the pictures below. First picture shows how it came from the factory with the female plastic fitting bottomed out against the threaded brass valve. Look at the fitting on the bottom of the picture.
Second pic showing new plastic Sharkbite fitting tightened but not bottomed against brass.
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