Ok. Thanks for pointing out solid thing while booleaning.
I tried inline script by selecting object > TAB > var gd = moi.geometryDatabase; gd.deselectAll(); var breps = gd.getObjects().getBreps(); for ( var i = 0; i < breps.length; ++i ) breps.item(i).getNakedEdges().setProperty( 'selected', true );> Enter > and nothing happened

Had to assign shortcut (also in latest V4).

But now it highlighted edges and have no idea how to close them effectively?
It's weird shapes inside object that I have no idea how happened as I was only booleing solids as far as I know.

Thanks