Hello, Duracell,
You might care to have a look in the board at the "ledge" against which the O ring tightens. Sometimes this "ledge" can have material on it which cuts/erodes the O ring, leading to failure.
Similarly, have a look on the shoulder of the vent screw, to see if the shoulder has a rough edge on it, which can cause the same problem.
Hope this helps.
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