Not visible in photo, I believe the holes you reference are an intersection within the oft mentioned "invisible circuits", cojoining between the air correction circuit, pilot screw, pilot jet and transition ports...
No, you can't block *any* holes within, thus my warning regarding liquids. I think I'm seeing a ridge in the now exposed plug orifice....some precise measuring required to calculate diameter and depth of the needed plug to enable permanent fix. The ridge is designed as a stop to prevent the plug from penetrating and blocking holes within.
PS the plug *must be* sealed airtight as well....allowed no ability whatsoever to vent.
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