The tests found a masking lacquer, left over from the build process, had blocked a vent hole.
Oopsie. Someone forgot to wash off the PVA before assembly.
4 posted on 10/30/2020 12:55:20 PM PDT by Ol' Dan Tucker
(For 'tis the sport to have the engineer hoist with his own petard., -- Hamlet, Act 3, Scene 4)